Factoring Mersenne numbers

ECM on 2^P-1, P < 10000

Curve counts in these tables assume B2=100*B1. This is the default for prime95. For maximum throughput, you should use GMP-ECM for stage 2 (and report an adjusted number of curves for updating this table).

Mersenne Numbers, no known factors

Digits in factor	30	35	40	45	50	55	60
Bound #1	250,000	1,000,000	3,000,000	11,000,000	44,000,000	110,000,000	260,000,000
Total curves needed	640	1580	4700	9700	17100	46500	112000
Curves needed over previous bound	600	1450	4250	8650	15000	40000	95000
1237	Done	Done	Done	Done	Done	600	2+50
1277	Done	Done	Done	Done	Done	600+200
1619	Done	Done	Done	Done	Done	600
1657	Done	Done	Done	Done	Done	600
1669	Done	Done	Done	Done	Done	600
1753	Done	Done	Done	Done	Done	470
2137	Done	Done	Done	Done	3865	0+50
2267	Done	Done	Done	Done	2350	0+200
2269	Done	Done	Done	Done	1805
2273	Done	Done	Done	Done	2315
2357	Done	Done	Done	Done	2480
2377	Done	Done	Done	Done	2739+5528
2423	Done	Done	Done	Done	700+1095
2477	Done	Done	Done	Done	600
2521	Done	Done	Done	Done	500
2557	Done	Done	Done	7900+1800	600
2671	Done	Done	Done	Done	680
2713	Done	Done	Done	8200+1500	605
2719	Done	Done	Done	Done	730
2851	Done	Done	Done	6390+3310	605
3049	Done	Done	Done	3500+6200	105+500
3607	Done	Done	Done	Done	750+645
3673	Done	Done	Done	Done	760+645
3691	Done	Done	Done	Done	760+645
3847	Done	Done	Done	Done	720+725
3881	Done	Done	Done	2360+10223	105+500
3919	Done	Done	Done	2360+9223	105+500
4007	Done	Done	Done	2860+9223	605
4049	Done	Done	Done	3360+9223	105
4111	Done	Done	Done	2345+9223	105
4159	Done	Done	Done	3380+9223	105
4261	Done	Done	Done	1360+10223	105
4363	Done	Done	Done	1710+10200	110
4567	Done	Done	Done	1560+9165	105
4583	Done	Done	Done	1460+10200	105
4591	Done	Done	Done	1460+10200	105
4703	Done	Done	Done	1360+9395	105
4721	Done	Done	Done	1662+9160	105
4937	Done	Done	Done	1560+9160	105
5309	Done	Done	Done	1450+9280	205
5443	Done	Done	Done	1500+9200	205
5471	Done	Done	Done	3450+6375	205
5503	Done	Done	Done	3550+6210	205
5839	Done	Done	Done	2300+7475	205
5879	Done	Done	Done	2302	205
5923	Done	Done	Done	1900+7820	205
6007	Done	Done	Done	1400+8395	249
6073	Done	Done	Done	950+8855	305
6211	Done	Done	Done	940	305
6247	Done	Done	Done	890	305
6329	Done	Done	Done	270+500	305
6577	Done	Done	Done	600+500	305
6581	Done	Done	Done	475	305
6679	Done	Done	Done	400+500	305
6733	Done	Done	Done	400+500	305
6763	Done	Done	Done	640+500	305
6971	Done	Done	Done	540+500	305
7069	Done	Done	Done	640+500	305
7127	Done	Done	Done	540+500	105+300
7321	Done	Done	Done	440+500	105+300
7351	Done	Done	Done	440+500	105+200
7621	Done	Done	Done	600+500	105+300
8291	Done	Done	Done	600+1000	105+200
8329	Done	Done	Done	500+1000	105+300
8369	Done	Done	Done	700+1000	105+100
8389	Done	Done	Done	700+500	105
8581	Done	Done	Done	300+500	105+200
8681	Done	Done	Done	310	105
8923	Done	Done	Done	310	676
8999	Done	Done	Done	380	105
9011	Done	Done	Done	275	105+200
9209	Done	Done	Done	400+500	126
9227	Done	Done	Done	500+500	200
9463	Done	Done	Done	560+500	200
9473	Done	Done	Done	560	200
9551	Done	Done	Done	500	200
9587	Done	Done	Done	500	750+200
9679	Done	Done	Done	500	100
9857	Done	Done	Done	500	700+200
9929	Done	Done	Done	6500	618+200

Mersenne Numbers, some known factors

Digits in factor	30	35	40	45	50	55	60
Bound #1	250,000	1,000,000	3,000,000	11,000,000	44,000,000	110,000,000	260,000,000
Total curves needed	640	1580	4700	9700	17100	46500	112000
Curves needed over previous bound	600	1450	4250	8650	15000	40000	95000
1201	Done	Done	Done	Done	500
1213	Done	Done	Done	Done	735
1217	Done	Done	Done	Done	735
1229	Done	Done	Done	Done	1075
1231	Done	Done	Done	Done	500
1249	Done	Done	Done	Done	515
1259	Done	Done	Done	Done	5
1283	Done	Done	Done	Done	5
1291	Done	Done	Done	Done	5
1297	Done	Done	Done	Done	5
1301	Done	Done	Done	Done
1319	Done	Done	Done	Done
1321	Done	Done	Done	Done
1367	Done	Done	Done	Done
1373	Done	Done	Done	Done
1381	Done	Done	Done	Done
1399	Done	Done	Done	Done	200
1409	Done	Done	Done	Done
1423	Done	Done	Done	Done
1429	Done	Done	Done	Done
1433	Done	Done	Done	3700
1439	Done	Done	Done	3700
1447	Done	Done	Done	3700
1451	Done	Done	Done	4200
1453	Done	Done	Done	3700
1471	Done	Done	Done	4050
1481	Done	Done	Done	4150
1483	Done	Done	Done	Done	350
1489	Done	Done	Done	3950
1493	Done	Done	Done	3700
1499	Done	Done	Done	3725
1511	Done	Done	Done	3790
1523	Done	Done	Done	3700
1543	Done	Done	Done	3700
1549	Done	Done	Done	3760
1559	Done	Done	Done	4700
1567	Done	Done	Done	3700
1571	Done	Done	Done	3800
1579	Done	Done	Done	3750
1583	Done	Done	Done	3950
1597	Done	Done	Done	3700
1601	Done	Done	Done	1200
1607	Done	Done	Done	4700
1609	Done	Done	Done	4700
1613	Done	Done	Done	4700
1621	Done	Done	Done	3900
1627	Done	Done	Done	3800
1663	Done	Done	Done	3700
1667	Done	Done	Done	3900
1697	Done	Done	Done	4700
1699	Done	Done	Done	3900
1709	Done	Done	Done	3400
1721	Done	Done	Done	3400
1723	Done	Done	Done	2900
1733	Done	Done	Done	3300
1741	Done	Done	Done	4200
1747	Done	Done	Done	4200
1759	Done	Done	Done	1700
1777	Done	Done	Done	400
1787	Done	Done	Done	1900
1789	Done	Done	Done	450
1801	Done	Done	Done	300
1811	Done	Done	Done	200
1823	Done	Done	Done	1200
1831	Done	Done	Done	200
1847	Done	Done	Done	300
1861	Done	Done	Done	200
1867	Done	Done	Done	200
1871	Done	Done	Done	200
1873	Done	Done	Done	200
1877	Done	Done	Done	1370
1879	Done	Done	Done	200
1889	Done	Done	Done	350
1901	Done	Done	Done	200
1907	Done	Done	Done	200
1913	Done	Done	Done	200
1931	Done	Done	Done	200
1933	Done	Done	Done	300
1949	Done	Done	Done	430
1951	Done	Done	Done	230
1973	Done	Done	Done	200
1979	Done	Done	Done	200
1987	Done	Done	Done	200
1993	Done	Done	Done	200
1999	Done	Done	Done	200
2003	Done	Done	Done	200
2011	Done	Done	Done	200
2017	Done	Done	Done	200
2027	Done	Done	Done	200
2029	Done	Done	Done	200
2039	Done	Done	Done	200
2053	Done	Done	Done	3295
2063	Done	Done	Done	200
2081	Done	Done	Done	200
2083	Done	Done	Done	1200
2087	Done	Done	Done	200
2089	Done	Done	Done	200
2099	Done	Done	Done	200
2111	Done	Done	Done	200
2113	Done	Done	Done	200
2129	Done	Done	Done	200
2131	Done	Done	Done	200
2141	Done	Done	Done	200
2143	Done	Done	Done	200
2153	Done	Done	Done	200
2161	Done	Done	Done	200
2179	Done	Done	Done	200
2207	Done	Done	Done	200
2213	Done	Done	Done	200
2221	Done	Done	Done	200
2237	Done	Done	Done	200
2239	Done	Done	Done	200
2243	Done	Done	Done	200
2287	Done	Done	Done	200
2293	Done	Done	Done	200
2297	Done	Done	Done	200
2309	Done	Done	Done	200
2333	Done	Done	Done	200
2339	Done	Done	Done	200
2341	Done	Done	Done	200
2347	Done	Done	Done	200
2351	Done	Done	Done	200
2371	Done	Done	Done	200
2381	Done	Done	Done	200
2389	Done	Done	Done	200
2393	Done	Done	Done	200
2399	Done	Done	Done	200
2411	Done	Done	Done	500
2417	Done	Done	Done	200
2437	Done	Done	Done	120
2441	Done	Done	Done	1020
2459	Done	Done	Done	120
2467	Done	Done	Done	200
2473	Done	Done	Done	300
2503	Done	Done	Done	300
2531	Done	Done	Done	30
2539	Done	Done	Done	200
2543	Done	Done	Done	20
2551	Done	Done	Done	230
2579	Done	Done	Done	230
2591	Done	Done	Done	230
2593	Done	Done	Done	600
2609	Done	Done	3850	500
2617	Done	Done	3850	500
2621	Done	Done	3350	500
2633	Done	Done	Done	500
2647	Done	Done	3350	500
2657	Done	Done	2350	500
2659	Done	Done	2350	500
2663	Done	Done	2350	500
2683	Done	Done	Done	425	605
2687	Done	Done	3800	500
2689	Done	Done	3800	500
2693	Done	Done	1850	500
2707	Done	Done	850	500
2711	Done	Done	850	500
2729	Done	Done	850	500
2731	Done	Done	Done	200
2741	Done	Done	Done	200
2749	Done	Done	350	500
2753	Done	Done	350
2767	Done	Done	350
2777	Done	Done	350
2789	Done	Done	350
2791	Done	Done	350
2797	Done	Done	452
2801	Done	Done	350
2803	Done	Done	350
2819	Done	Done	360
2833	Done	Done	350
2843	Done	Done	400
2857	Done	Done	400
2861	Done	Done	400
2879	Done	Done	400
2887	Done	Done	400
2897	Done	Done	650
2903	Done	Done	1350
2917	Done	Done	350
2939	Done	Done	350
2953	Done	Done	350
2957	Done	Done	350
2963	Done	Done	350
2969	Done	Done	350
2971	Done	Done	350
2999	Done	Done	350
3001	Done	Done	1350	250
3011	Done	Done	1350	250
3019	Done	Done	1430	250
3023	Done	Done	2350	250
3037	Done	Done	350	250
3061	Done	Done	350	250
3067	Done	Done	350	250
3083	Done	Done	430
3089	Done	Done	350
3109	Done	Done	350
3119	Done	Done	350
3121	Done	Done	360
3137	Done	Done	350
3163	Done	Done	350	250
3167	Done	Done	350	500
3169	Done	Done	350	250
3181	Done	Done	350
3187	Done	Done	350
3191	Done	Done	350
3203	Done	Done	350
3209	Done	Done	350
3221	Done	Done	350
3229	Done	Done	350
3251	Done	Done	350
3253	Done	Done	350
3257	Done	Done	350
3271	Done	Done	350
3299	Done	Done	350
3301	Done	Done	350
3307	Done	Done	450
3313	Done	Done	350
3319	Done	Done	350
3323	Done	Done	350
3329	Done	Done	355
3331	Done	Done	360
3343	Done	Done	Done	4900	605
3347	Done	Done	440
3361	Done	Done	440
3371	Done	Done	440
3373	Done	Done	455
3389	Done	Done	425
3391	Done	Done	555
3407	Done	Done	425
3413	Done	Done	355
3433	Done	Done	355
3449	Done	Done	355
3457	Done	Done	355
3461	Done	Done	355
3463	Done	Done	355
3467	Done	Done	360
3469	Done	Done	355
3491	Done	Done	350
3499	Done	Done	355
3511	Done	Done	375
3517	Done	Done	375
3527	Done	Done	375
3529	Done	Done	455
3533	Done	Done	955
3539	Done	Done	955
3541	Done	Done	955
3557	Done	Done	955
3559	Done	Done	455
3571	Done	Done	455
3581	Done	Done	455
3583	Done	Done	355
3593	Done	Done	455
3613	Done	Done	355
3617	Done	Done	355
3623	Done	Done	355
3631	Done	Done	355
3637	Done	Done	355
3643	Done	Done	Done	200
3659	Done	Done	1460
3671	Done	Done	1450
3677	Done	Done	1455
3697	Done	Done	1455
3701	Done	Done	1555
3709	Done	Done	1655
3719	Done	Done	455
3727	Done	Done	455
3733	Done	Done	455
3739	Done	Done	455
3761	Done	Done	455
3767	Done	Done	455
3769	Done	Done	455
3779	Done	Done	455
3793	Done	Done	455
3797	Done	Done	455
3803	Done	Done	355
3821	Done	Done	455
3823	Done	Done	355
3851	Done	Done	455
3853	Done	Done	455
3863	Done	Done	480
3877	Done	Done	455
3889	Done	Done	455
3907	Done	Done	455
3911	Done	Done	455
3917	Done	Done	455
3923	Done	Done	455
3929	Done	Done	455
3931	Done	Done	455
3943	Done	Done	455
3947	Done	Done	450
3967	Done	Done	450
3989	Done	Done	450
4001	Done	Done	Done	200
4003	Done	Done	Done	200
4013	Done	Done	Done	200
4019	Done	Done	1121
4021	Done	Done	1005
4027	Done	Done	2600
4051	Done	Done	1490
4057	Done	Done	455
4073	Done	Done	455
4079	Done	Done	455
4091	Done	Done	460
4093	Done	Done	455
4099	Done	Done	1455
4129	Done	Done	1455
4133	Done	Done	1455
4139	Done	Done	1540
4153	Done	Done	1655
4157	Done	Done	1205
4177	Done	Done	Done	1530	105
4201	Done	Done	455
4211	Done	Done	650
4217	Done	Done	455
4219	Done	Done	455
4229	Done	Done	455
4231	Done	Done	455
4241	Done	Done	455
4259	Done	Done	455
4271	Done	Done	455
4273	Done	Done	455
4283	Done	Done	630
4289	Done	Done	455
4297	Done	Done	455
4327	Done	Done	455
4337	Done	Done	455
4339	Done	Done	455
4349	Done	Done	455
4357	Done	Done	457
4373	Done	Done	455
4391	Done	Done	455
4397	Done	Done	455
4409	Done	Done	455
4421	Done	Done	455
4441	Done	Done	455
4447	Done	Done	455
4451	Done	Done	455	150
4457	Done	Done	455
4463	Done	Done	950
4481	Done	Done	690	35	10
4483	Done	Done	950
4493	Done	Done	950
4507	Done	Done	605
4513	Done	Done	800
4517	Done	Done	455
4519	Done	Done	455
4523	Done	Done	455
4547	Done	Done	455
4549	Done	Done	455
4561	Done	Done	455
4597	Done	Done	455
4603	Done	Done	455
4621	Done	Done	455
4637	Done	Done	455
4639	Done	Done	455
4643	Done	Done	455
4649	Done	Done	455
4651	Done	Done	455
4657	Done	Done	455
4663	Done	Done	455
4673	Done	Done	455
4679	Done	Done	455
4691	Done	Done	455
4723	Done	Done	455
4733	Done	Done	455
4759	Done	Done	455
4783	Done	Done	352
4787	Done	Done	355	100
4789	Done	Done	355
4793	Done	Done	355
4799	Done	Done	Done	2560	105
4801	Done	Done	355
4813	Done	Done	355
4817	Done	Done	357
4831	Done	Done	355
4861	Done	Done	355
4877	Done	Done	355
4889	Done	Done	355
4903	Done	Done	355
4909	Done	Done	355
4919	Done	Done	355
4931	Done	Done	355
4933	Done	Done	355
4943	Done	Done	355	100
4951	Done	Done	355
4957	Done	Done	355
4967	Done	Done	355
4969	Done	Done	355
4973	Done	Done	Done	6630	105
4987	Done	Done	355
4993	Done	Done	360	5
4999	Done	Done	360	5
5003	Done	Done	1350
5009	Done	Done	1506
5011	Done	Done	1350
5021	Done	Done	1350
5023	Done	Done	1350
5039	Done	Done	1350
5051	Done	Done	1350
5059	Done	Done	1350
5077	Done	Done	1350
5081	Done	Done	1350
5099	Done	Done	1350
5101	Done	Done	350
5107	Done	Done	350
5113	Done	Done	350
5119	Done	Done	350
5147	Done	Done	350
5153	Done	Done	350
5167	Done	Done	350
5171	Done	Done	350
5179	Done	Done	350
5189	Done	Done	350
5197	Done	Done	350
5209	Done	Done	350
5231	Done	Done	350
5233	Done	Done	350
5237	Done	Done	350
5261	Done	Done	350
5273	Done	Done	350
5279	Done	Done	350
5281	Done	Done	350
5297	Done	Done	350
5303	Done	Done	350
5323	Done	Done	350
5333	Done	Done	350
5347	Done	Done	350
5351	Done	Done	350
5381	Done	Done	350
5387	Done	Done	350
5393	Done	Done	350
5399	Done	Done	350
5407	Done	Done	350
5413	Done	Done	350
5417	Done	Done	350
5419	Done	Done	350
5431	Done	Done	350
5437	Done	Done	350
5441	Done	Done	350
5449	Done	Done	350
5477	Done	Done	350
5479	Done	Done	1704	100	5
5483	Done	Done	350
5501	Done	Done	350
5507	Done	Done	350
5519	Done	Done	350
5521	Done	Done	350
5527	Done	Done	350
5531	Done	Done	350
5557	Done	Done	350
5563	Done	Done	350
5569	Done	Done	350
5573	Done	Done	350
5581	Done	Done	Done	200
5591	Done	Done	350
5623	Done	Done	350
5639	Done	Done	350
5641	Done	Done	350
5647	Done	Done	350
5651	Done	Done	350
5653	Done	Done	350
5657	Done	Done	350
5659	Done	Done	350
5669	Done	Done	350
5683	Done	Done	350
5693	Done	Done	350
5701	Done	Done	350
5711	Done	Done	350
5717	Done	Done	350
5737	Done	Done	350
5741	Done	Done	350
5743	Done	Done	350
5749	Done	Done	350
5779	Done	Done	350
5783	Done	Done	2352	200	5
5791	Done	Done	350
5801	Done	Done	350
5807	Done	Done	350
5813	Done	Done	Done	550	205
5821	Done	Done	355
5827	Done	Done	355
5843	Done	Done	355
5849	Done	Done	355
5851	Done	Done	352
5857	Done	Done	355
5861	Done	Done	355
5867	Done	Done	355
5869	Done	Done	355
5881	Done	Done	355
5897	Done	Done	355
5903	Done	Done	355
5927	Done	Done	355
5939	Done	Done	355
5953	Done	Done	355
5981	Done	Done	355
5987	Done	Done	355
6011	Done	Done	355
6029	Done	Done	355
6037	Done	Done	355
6047	Done	Done	355
6053	Done	Done	355
6067	Done	Done	355
6079	Done	Done	358	100	505
6089	Done	Done	355
6091	Done	Done	355
6101	Done	Done	355
6113	Done	Done	355
6121	Done	Done	355
6131	Done	Done	355
6133	Done	Done	355
6143	Done	Done	355
6151	Done	Done	355
6163	Done	Done	355
6173	Done	Done	355
6197	Done	Done	355
6199	Done	Done	355
6203	Done	Done	355
6217	Done	Done	355
6221	Done	Done	355
6229	Done	Done	355
6257	Done	Done	355
6263	Done	Done	355
6269	Done	Done	355
6271	Done	Done	355
6277	Done	Done	355
6287	Done	Done	355
6299	Done	Done	355
6301	Done	Done	355
6311	Done	Done	355
6317	Done	Done	355
6323	Done	Done	355
6337	Done	Done	355
6343	Done	Done	355
6353	Done	Done	352
6359	Done	Done	355
6361	Done	Done	355
6367	Done	Done	355
6373	Done	Done	485
6379	Done	Done	285
6389	Done	Done	285
6397	Done	Done	285
6421	Done	Done	460
6427	Done	Done	360
6449	Done	Done	355
6451	Done	Done	355
6469	Done	Done	355
6473	Done	Done	355
6481	Done	Done	355
6491	Done	Done	355
6521	Done	Done	355
6529	Done	Done	355
6547	Done	Done	355
6551	Done	Done	355
6553	Done	Done	355
6563	Done	Done	355
6569	Done	Done	290
6571	Done	Done	355
6599	Done	Done	355
6607	Done	Done	355
6619	Done	Done	265
6637	Done	Done	355
6653	Done	Done	355
6659	Done	Done	400
6661	Done	Done	355
6673	Done	Done	755
6689	Done	Done	755
6691	Done	Done	745
6701	Done	Done	355
6703	Done	Done	355
6709	Done	Done	300
6719	Done	Done	355
6737	Done	Done	355
6761	Done	Done	255	30
6779	Done	Done	355
6781	Done	Done	355
6791	Done	Done	355
6793	Done	Done	825
6803	Done	Done	355
6823	Done	Done	355
6827	Done	Done	355
6829	Done	Done	355
6833	Done	Done	355
6841	Done	Done	355
6857	Done	Done	355
6863	Done	Done	355
6869	Done	Done	355
6871	Done	Done	355
6899	Done	Done	295
6907	Done	Done	355
6911	Done	Done	355
6917	Done	Done	355
6947	Done	Done	355
6949	Done	Done	355	11
6959	Done	Done	295
6961	Done	Done	355
6967	Done	Done	355
6977	Done	Done	355
6983	Done	Done	355
6991	Done	Done	264
6997	Done	Done	295
7001	Done	Done	355	250
7013	Done	Done	355	41
7019	Done	Done	355	200
7027	Done	Done	355
7043	Done	Done	355
7057	Done	Done	355
7079	Done	Done	355
7103	Done	Done	355
7109	Done	Done	355
7121	Done	Done	355
7129	Done	Done	354
7151	Done	Done	354
7159	Done	Done	355
7177	Done	Done	355
7187	Done	Done	355
7193	Done	Done	355
7207	Done	Done	355
7211	Done	Done	355
7213	Done	Done	355
7219	Done	Done	355
7229	Done	Done	355
7237	Done	Done	355
7243	Done	Done	355
7247	Done	Done	355
7253	Done	Done	355
7283	Done	Done	355
7297	Done	Done	355
7307	Done	Done	285
7309	Done	Done	285
7333	Done	Done	285
7349	Done	Done	285
7369	Done	Done	282
7393	Done	Done	500
7411	Done	Done	355
7433	Done	Done	670
7451	Done	Done	670
7457	Done	Done	670
7459	Done	Done	670
7477	Done	Done	Done	220	105
7481	Done	Done	295
7487	Done	Done	295
7489	Done	Done	295
7499	Done	Done	295
7507	Done	Done	290
7517	Done	Done	290
7523	Done	Done	250
7529	Done	Done	250
7537	Done	Done	290
7541	Done	Done	290
7547	Done	Done	250
7549	Done	Done	250
7559	Done	Done	250
7561	Done	Done	250
7573	Done	Done	250
7577	Done	Done	250
7583	Done	Done	250
7589	Done	Done	250
7591	Done	Done	250
7603	Done	Done	250
7607	Done	Done	250
7639	Done	Done	290
7643	Done	Done	290
7649	Done	Done	250
7669	Done	Done	250
7681	Done	Done	250
7687	Done	Done	250
7691	Done	Done	250
7699	Done	Done	250
7703	Done	Done	280
7717	Done	Done	280
7723	Done	Done	280
7727	Done	Done	280
7741	Done	Done	280
7753	Done	Done	250
7759	Done	Done	280
7789	Done	Done	250
7793	Done	Done	250
7817	Done	Done	250
7823	Done	Done	250
7829	Done	Done	250
7841	Done	Done	250
7853	Done	1270	250
7867	Done	Done	Done	1300	392
7873	Done	1240	250
7877	Done	1270	250
7879	Done	1220	250
7883	Done	1220	250
7901	Done	Done	280
7907	Done	Done	280
7919	Done	Done	285
7927	Done	Done	285
7933	Done	Done	285
7937	Done	Done	285
7949	Done	Done	255
7951	Done	Done	255
7963	Done	Done	255
7993	Done	Done	255
8009	Done	Done	355
8011	Done	Done	355
8017	Done	Done	355
8039	Done	Done	360
8053	Done	Done	255
8059	Done	Done	255
8069	Done	Done	255
8081	Done	Done	255
8087	Done	Done	250
8089	Done	Done	250
8093	Done	Done	250
8101	Done	Done	250
8111	Done	Done	250
8117	Done	Done	255
8123	Done	Done	255
8147	Done	Done	255
8161	Done	Done	255
8167	Done	Done	255
8171	Done	Done	255
8179	Done	Done	255
8191	Done	Done	Done	Done	650
8209	Done	Done	285
8219	Done	Done	285
8221	Done	Done	285
8231	Done	1303	255
8233	Done	Done	630	453	5
8237	Done	Done	255
8243	Done	Done	255
8263	Done	Done	255
8269	Done	Done	255
8273	Done	Done	255
8287	Done	Done	255
8293	Done	Done	255
8297	Done	Done	350
8311	Done	Done	285
8317	Done	Done	685
8353	Done	Done	685
8363	Done	Done	265
8377	Done	Done	685
8387	Done	Done	255
8419	Done	Done	255
8423	Done	Done	255
8429	Done	Done	255
8431	Done	Done	255
8443	Done	Done	255
8447	Done	Done	255
8461	Done	Done	255
8467	Done	Done	255
8501	Done	Done	355
8513	Done	Done	355
8521	Done	Done	775
8527	Done	Done	355
8537	Done	Done	255
8539	Done	Done	255
8543	Done	Done	255
8563	Done	Done	255
8573	Done	Done	255
8597	Done	Done	255
8599	Done	Done	255
8609	Done	Done	1350	200	83
8623	Done	Done	255
8627	Done	Done	255
8629	Done	Done	255
8641	Done	Done	255
8647	Done	Done	950	10	5
8663	Done	Done	355
8669	Done	Done	255
8677	Done	Done	255
8689	Done	Done	255
8693	Done	Done	255
8699	Done	Done	255
8707	Done	Done	255
8713	Done	Done	255
8719	Done	Done	255
8731	Done	Done	255
8737	Done	Done	255
8741	Done	Done	255
8747	Done	Done	255
8753	Done	Done	255
8761	Done	Done	255
8779	Done	Done	255
8783	Done	Done	255
8803	Done	Done	285
8807	Done	Done	285
8819	Done	Done	285
8821	Done	Done	285
8831	Done	Done	800
8837	Done	Done	285
8839	Done	Done	285
8861	Done	Done	285
8863	Done	Done	285
8867	Done	Done	290
8887	Done	Done	255
8893	Done	Done	290
8929	Done	Done	290
8933	Done	Done	290
8941	Done	Done	290
8951	Done	Done	290
8963	Done	Done	290
8969	Done	Done	255
8971	Done	Done	255
9001	Done	Done	355
9007	Done	Done	255
9013	Done	Done	255
9029	Done	Done	255
9041	Done	Done	295
9043	Done	Done	295
9049	Done	Done	295
9059	Done	Done	290
9067	Done	Done	290
9091	Done	Done	410
9103	Done	Done	285
9109	Done	Done	255
9127	Done	Done	255
9133	Done	Done	3590	100	862
9137	Done	Done	255
9151	Done	Done	255
9157	Done	Done	255
9161	Done	Done	255
9173	Done	Done	255
9181	Done	Done	255
9187	Done	Done	1320		84
9199	Done	Done	255
9203	Done	Done	255
9221	Done	Done	255
9239	Done	Done	255
9241	Done	Done	255
9257	Done	70	255
9277	Done	70	252
9281	Done	70	255
9283	Done	70	255
9293	Done	70	255
9311	Done	Done	255
9319	Done	Done	255
9323	Done	Done	255
9337	Done	Done	280
9341	Done	Done	280
9343	Done	Done	285
9349	Done	Done	285
9371	Done	Done	285
9377	Done	Done	250
9391	Done	Done	250
9397	Done	Done	250
9403	Done	Done	250
9413	Done	Done	250
9419	Done	Done	250
9421	Done	Done	250
9431	Done	Done	250
9433	Done	Done	250
9437	Done	Done	250
9439	Done	Done	250
9461	Done	Done	250
9467	Done	Done	250
9479	Done	Done	250
9491	Done	Done	250
9497	Done	Done	250
9511	Done	Done	250
9521	Done	Done	250
9533	Done	Done	250
9539	Done	Done	250
9547	Done	Done	250
9601	Done	Done	250
9613	Done	Done	250
9619	Done	Done	250
9623	Done	Done	250
9629	Done	Done	250
9631	Done	Done	350
9643	Done	Done	250
9649	Done	Done	350
9661	Done	Done	350
9677	Done	Done	350
9719	Done	Done	350
9721	Done	Done	350
9739	Done	Done	450
9743	Done	Done	350
9749	Done	Done	287
9767	Done	Done	669
9769	Done	Done	350
9781	Done	Done	250
9787	Done	Done	350
9791	Done	Done	350
9803	Done	Done	350
9811	Done	Done	300
9817	Done	Done	350
9829	Done	Done	350
9833	Done	Done	350
9839	Done	Done	892
9851	Done	Done	250
9859	Done	Done	350
9871	Done	Done	350
9883	Done	Done	320
9887	Done	Done	350
9907	Done	Done	965
9923	Done	Done	352
9931	Done	Done	350
9949	Done	Done	400
9967	Done	Done	350
9973	Done	Done	500

Factors found recently

M7901 has a factor: 54052096136682432292747785815830169
M2657 has a factor: 89949828963946355566706899035478721805841
M9547 has a factor: 8870060337839649268018893272220199
M1607 has a factor: 14950998663475271751814476834378599253816793
M7603 has a factor: 923076980788359348074835915062253631
M8231 has a factor: 526731815247335216234269586171071
M9413 has a factor: 859274854814801166088030994389589549033
M8641 has a factor: 30353651823056120943831476457739926077297
M8363 has a factor: 17329758935264249484110924882111
M1709 has a factor: 29015032394371006564513715526946615358047

Factors found thusfar

M1201 has a factor: 2830858618432184648159211485423
M1249 has a factor: 9345276045907272726364012481
M1283 has a factor: 4824675346114250541198242904214396192319^*
M1301 has a factor: 161317830296866767945829203107381353^*
M1307 has a factor: 161633497146742177992711798481
M1307 has a factor: 141196558805510033914433414063^**
M1319 has a factor: 4561015525367423385817952015799767
M1319 has a factor: 528143874978418020442958250948319387628471
M1361 has a factor: 856450061281312036458486309832227737^**
M1381 has a factor: 324347780588879609356756802551
M1409 has a factor: 34649857787874317478304238154673687249
M1447 has a factor: 329476003535938830704093614193630509247
M1483 has a factor: 910188101009715972185070554697411008108729^*
M1493 has a factor: 9128086063638824541964831110329768544223
M1511 has a factor: 2761697628956368449233082210462148759
M1523 has a factor: 182902246957664987166063221498412840793
M1553 has a factor: 432076532964254217618937
M1553 has a factor: 67625467049371226906709645391
M1553 has a factor: 169336513704068271013494661928987033^**
M1567 has a factor: 31523570928926921025805379993
M1597 has a factor: 46421116904392458242754417331076737^*
M1607 has a factor: 14950998663475271751814476834378599253816793
M1609 has a factor: 143805067268178342851461157655703
M1613 has a factor: 14289797186510260285068439
M1613 has a factor: 119549552138019464176947313
M1667 has a factor: 149884935262976855081303041
M1693 has a factor: 3361912721093432406946778492953
M1693 has a factor: 21637859486326546740118800926236362073^**
M1697 has a factor: 41749699092786282661994591
M1709 has a factor: 29015032394371006564513715526946615358047
M1723 has a factor: 782974566556895066995270439431
M1733 has a factor: 29042669704339553664002303^*
M1741 has a factor: 25269109534063262433544878967583
M1759 has a factor: 4673652603342055740007000595229032807
M1777 has a factor: 113460041673379080737466244127
M1777 has a factor: 3045915502335859982042057324006039124823
M1783 has a factor: 21991704205191358757046463
M1783 has a factor: 1943163990190458280022304032374692151^**
M1787 has a factor: 928369344831808006294056018847247
M1787 has a factor: 29794731703779691497303302213997084977
M1789 has a factor: 3278051851070015836353451777
M1861 has a factor: 33384230094125728479194737
M1861 has a factor: 572590482607449584967217450937
M1871 has a factor: 144708840548945683444663720144318711
M1879 has a factor: 601894931988703001817610962863642009
M1889 has a factor: 305847916137939752397216527569009633
M1901 has a factor: 46956007702768755352376009
M1901 has a factor: 711036999248971443186001729441
M1907 has a factor: 1685696416143478298579153^*
M1933 has a factor: 6118054056737236933100274795279001290402841
M1951 has a factor: 16297294059349258932713984073367
M1979 has a factor: 11349904759198125072187718192234394369366617
M1987 has a factor: 63713905345969986120190693589745461903
M1993 has a factor: 4169656201719372099729206249327
M1997 has a factor: 342849716969843931264330628335073^**
M1999 has a factor: 5347162249018972109619200063610257
M1999 has a factor: 1835925785367240799404436249922514003983
M2027 has a factor: 147630066980845001082205680679687
M2029 has a factor: 1673313842828044768165904644769
M2039 has a factor: 8451632300663404578500000977
M2053 has a factor: 3994132379033469883845814767575996546561^*
M2069 has a factor: 1776510807594595616100267889706057^**
M2083 has a factor: 10856096517744407116404211624899190239961
M2087 has a factor: 13972903680989405047308631
M2087 has a factor: 46569645515600223410122662599
M2087 has a factor: 700690973459435662005774886079
M2111 has a factor: 207314882478786823922863639
M2113 has a factor: 37980882217929022983473
M2113 has a factor: 101936210855894546221988426464097
M2129 has a factor: 91216137441620511446965843907479
M2129 has a factor: 108068566182420711751512127807271^*
M2131 has a factor: 129239458251829470983931962239
M2161 has a factor: 117194366114889271070074059667667222873^*
M2179 has a factor: 872880838101847103099257
M2179 has a factor: 18274230550099239490658159
M2207 has a factor: 264355765770812639190253663
M2207 has a factor: 36154241258362723105218653006331225161
M2237 has a factor: 62230238489139119544516113^*
M2237 has a factor: 261337758224595425287763910254222231
M2251 has a factor: 17620954939878356226435007^**
M2309 has a factor: 90872630724974134166363993
M2311 has a factor: 4514379640917651135021865565129^**
M2347 has a factor: 23874503408349657640060077253301231
M2347 has a factor: 47387666081806935002124547582754328449
M2371 has a factor: 28568912976706210432008328195128151
M2381 has a factor: 6680044871611436077197194505521
M2383 has a factor: 889865441849036810633962436005361^**
M2389 has a factor: 2093271445020575996334084727
M2389 has a factor: 26780099201337798784371973605537377
M2399 has a factor: 2571239126783847937422658871
M2411 has a factor: 2080665358357882514154387257
M2413 has a factor: 11409394742048484313247959295076817
M2417 has a factor: 496761038703890397539474075436768232031
M2437 has a factor: 35465752181921322084951688471
M2447 has a factor: 459390495235738452861593
M2447 has a factor: 3922634957266302331319319913
M2447 has a factor: 24700068031700569654277801^**
M2459 has a factor: 1154202936950706985522736519
M2459 has a factor: 16369795604971929334493192254777
M2473 has a factor: 675776375918366488261673
M2503 has a factor: 271110371579809135484488546748281791049761891239
M2543 has a factor: 106329718329660590327571143
M2543 has a factor: 120202769989830422569666183518726135371191
M2549 has a factor: 324013067177330948216089046508086969^**
M2579 has a factor: 29591195938820133231287179633
M2579 has a factor: 1380070842173844993873584205272335320325626193
M2591 has a factor: 1181791842810499862725484463029336207
M2593 has a factor: 4995038229928547871581359
M2633 has a factor: 23936809821603623449877646457097
M2657 has a factor: 89949828963946355566706899035478721805841
M2659 has a factor: 501684732128661279261735988972169
M2659 has a factor: 4813564638056660907139553033879
M2663 has a factor: 122833083008032212960630676991
M2677 has a factor: 585294986690122657135969
M2677 has a factor: 81699346406928829474760749455463^**
M2687 has a factor: 124157335530549222388320183613657
M2693 has a factor: 870270725149352109367
M2741 has a factor: 77986282883139621602511217283307569
M2749 has a factor: 71379967497493020878447720712937
M2789 has a factor: 646806236672569040403110057249
M2789 has a factor: 1175852797876979631858722975195410428697
M2791 has a factor: 58703608612851907470497^*
M2797 has a factor: 21302877855270603243781956883847214766183^*
M2843 has a factor: 6764674606481895012865795514903
M2879 has a factor: 207800394424689592192394909561
M2903 has a factor: 6345446910644914140703
M2903 has a factor: 221290227668343044301796313
M2909 has a factor: 2810063687215981074703243943^**
M2917 has a factor: 49028383768543976339855110223
M2939 has a factor: 9162714245445569872926377
M2939 has a factor: 20464934283445341980094981769009868005537
M2953 has a factor: 486002993749998304495917053222119
M2963 has a factor: 596336323552300302845434367
M2999 has a factor: 4545709060780082037089231
M3001 has a factor: 475813979949564007293290475410417
M3079 has a factor: 25324846649810648887383180721^*,**
M3089 has a factor: 91331189000126892893989706291353
M3137 has a factor: 3574068155905681942166392231
M3167 has a factor: 44913375485406244351324919324730167
M3187 has a factor: 160489310414599715642693513
M3191 has a factor: 3051176894854767815130533410847
M3191 has a factor: 11296174004756232698797243192821959
M3191 has a factor: 5429264746931713615548606598055124977
M3209 has a factor: 101202489584358535872055967699759
M3229 has a factor: 26075647522685549681041
M3229 has a factor: 13377504648172725132274511
M3259 has a factor: 21926805872270062496819221124452121^*,**
M3271 has a factor: 8325300186033592877342321
M3299 has a factor: 412235388767582094720074519
M3301 has a factor: 62144503086135674939811996503
M3301 has a factor: 15017388018757677336244144569913
M3307 has a factor: 2034656323703532334145890988609
M3313 has a factor: 696225225527825611463
M3313 has a factor: 120476824658723287206713238495837161
M3329 has a factor: 91426284391067547105319
M3331 has a factor: 1961053495347223343004489751^*
M3343 has a factor: 21395366139013330348249888032891790630577329313^*
M3361 has a factor: 59987981488841905677207058789657
M3371 has a factor: 164673606272685736770361
M3373 has a factor: 12217989468474155307522423060767
M3407 has a factor: 28517111507833305367
M3407 has a factor: 363742967975297441491290313
M3413 has a factor: 708502447412410598209
M3449 has a factor: 259821377195580883858271
M3461 has a factor: 321172740126659477699594681881^*
M3467 has a factor: 4913650657744912439^*
M3467 has a factor: 44206619588662227998657
M3469 has a factor: 49099830535845038692501139425951^*
M3511 has a factor: 67524431877448905876399670391
M3517 has a factor: 20530547049316704681299430895926770305903
M3533 has a factor: 21216001670174028278657
M3533 has a factor: 718089294421474108457
M3541 has a factor: 53902951343063015377
M3541 has a factor: 7697415903242359504663
M3557 has a factor: 66957592921108564764663943
M3571 has a factor: 199866090993376388761
M3571 has a factor: 13455285154349817337805045818309111
M3623 has a factor: 20115815141860702130200884527
M3631 has a factor: 280442211872714548472527
M3637 has a factor: 2914077909273961700066540881
M3677 has a factor: 2023351572759399099610229657
M3697 has a factor: 3285437543016437084329
M3701 has a factor: 228898605233001999017
M3709 has a factor: 225210358294013561874414316954513^*
M3709 has a factor: 179661997396749084606181075339039
M3727 has a factor: 1998930621797847308375383
M3739 has a factor: 87324492488943933757801
M3767 has a factor: 337116294660910764115481
M3769 has a factor: 285870043535850462497164075644217
M3779 has a factor: 3476227576267836521
M3779 has a factor: 2078022893280176212649
M3793 has a factor: 799074295023809515949432177
M3793 has a factor: 15489069026575436129311218673197959
M3833 has a factor: 340789152474053904109001^**
M3851 has a factor: 372657833058540944162736611842241
M3851 has a factor: 423739552690562137895757329358023
M3853 has a factor: 2100656437769064573899772266936926591
M3853 has a factor: 257056372314429393905874808530805991327
M3877 has a factor: 209468118715627008481
M3889 has a factor: 52340768390681559948754477156073
M3907 has a factor: 9566938384835040574922000897
M3911 has a factor: 36321458453183426781103
M3911 has a factor: 166254254351927965517863935760773095257
M3917 has a factor: 4606265160215972929759
M3923 has a factor: 576576615840313157183
M3923 has a factor: 1694839582876806072669316984852297
M3943 has a factor: 5775542085311759725360823053919^*
M3947 has a factor: 819936352573701329
M3947 has a factor: 496290850493839161950725705883941969289
M3967 has a factor: 33282967072216901411185356481
M4001 has a factor: 18263906015753203889857678951
M4013 has a factor: 143170830211583638257737297
M4019 has a factor: 151415752220337227148079031479
M4019 has a factor: 4462895007329107203212412618387041
M4021 has a factor: 2889358374295985266660480623679
M4021 has a factor: 1805978952876778448258839710221983
M4027 has a factor: 82185762602338638075357407556967313^*
M4057 has a factor: 228819713966222609405733577380694244969
M4091 has a factor: 1009611726327533941115754978617^*
M4099 has a factor: 134184298503772840453580704960897
M4133 has a factor: 47094380243554351073
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M9643 has a factor: 457335736472136669072312395951
M9643 has a factor: 1423789230517411388894976768640621783
M9697 has a factor: 19092282046942032847^**
M9719 has a factor: 75309171260423390037747764207^*
M9721 has a factor: 14144348109786497832711164593^*
M9733 has a factor: 353435802999708808999
M9733 has a factor: 4424579967215442704801447^**
M9739 has a factor: 259908822802932530786005423324417247
M9749 has a factor: 65903609610877159128829561609634790791
M9767 has a factor: 963679519756293838342359610297^*
M9781 has a factor: 176141975350148346616820497^*
M9781 has a factor: 3528158360791942352329812337769
M9811 has a factor: 33095956708798297
M9811 has a factor: 384438101927996319709178028450440287
M9839 has a factor: 347473658991985642372113697652983^*
M9851 has a factor: 14177526370584537994393252454153
M9883 has a factor: 1753018713541977529
M9883 has a factor: 740958100482716677361
M9883 has a factor: 52777604336327421559117167977173663
M9901 has a factor: 4512717821471308759
M9901 has a factor: 8336998551279784091551
M9901 has a factor: 1017688752041649660766793
M9901 has a factor: 25146117302614435382787771401
M9901 has a factor: 1502440689076527620360606617623599^**
M9907 has a factor: 35132666058874954099939688872921^*
M9923 has a factor: 4029959159110633611919371121923073
M9967 has a factor: 41557302123847080424871^*
^* indicates first known factor.
^** indicates factorization of the number is now complete.

Last updated: December 16, 2007

ECM on 2P-1, P < 10000

Mersenne Numbers, no known factors

Mersenne Numbers, some known factors

Factors found recently

Factors found thusfar

ECM on 2^P-1, P < 10000