4 049 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁶⁶

TF target 2⁴⁴

TF below 2^214 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	80000000000
B2 =	805164698570622390

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	640 / 640
35	1000000	1566 / 1566
40	3000000	4588 / 4588
45	11000000	9201 / 9201
50	44000000	16550 / 16550
55	110000000	40830 / 40830
60	260000000	105362 / 105362
65	800000000	194238 / 194238
70	2400000000	69906 / 350860

Estimated T-Level: 66.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	32B0	0
Verified		George Woltman	70D50E527823B2B0	0
Verified		Brian J. Beesley	70D50E527823B2B0	0
Verified	2015-04-11	MadPoo	70D50E527823B2B0	2892

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-02-20	NStorm	factor ECM small	C1S1	89.47 %	2025-02-21
2025-02-20	NStorm	factor ECM small	C1S2	49.74 %	2025-02-21

History

Date	User	Type	Result
2023-08-14	masser	NF-PP1	Start=6/5, B1=2280000000, B2=408120000000
2023-07-10	masser	NF-PP1	Start=193/29, B1=2280000000, B2=91200000000
2023-05-16	-Anonymous-	NF-PM1	B1=80000000000, B2=805164698570622390
2022-06-28	Anton Repko	NF	no factor from 2^65 to 2^66
2021-05-13	ATH	NF-PP1	Start=2/7, B1=1000000000, B2=241000000000
2021-02-07	Anton Repko	NF	no factor from 2^64 to 2^65
2018-06-01	snme2pm1	NF	no factor from 2^63 to 2^64
2016-11-08	snme2pm1	NF	no factor from 2^62 to 2^63
2016-05-14	-Anonymous-	NF-PM1	B1=200000000000, B2=2000000000000, E=12
2016-05-12	-Anonymous-	NF-PM1	B1=100000000000, B2=1000000000000, E=12
2016-02-23	LaurV	NF	no factor from 2^57 to 2^58
2015-06-04	Sid & Andy	NF	no factor from 2^61 to 2^62
2015-04-11	MadPoo	C-LL	70D50E527823B2B0
2012-09-29	bcp19	NF	no factor from 2^60 to 2^61
2011-03-20	kurly	NF-PM1	B1=10000000000, B2=500000000000, E=12
2011-02-09	monst	NF	no factor from 2^58 to 2^60