1 259 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 2 known prime factors. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
875965965904153	15	49.6	old
12837801903260418659222502180271368969172790209999210831	56	183.1	2014-05-21 01:53:51

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	84258 / 194238

Estimated T-Level: 62.2 ⓘ

TF below 2^202 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-27	Oliver Kruse	EBCA1555A98ECAF7	2	0	1	3
Verified	2017-10-09	Chang Chia-Tche	EBCA1555A98ECAF7	2	0	1	3
Verified	2017-10-12	kkmrkkblmbrbk	EBCA1555A98ECAF7	2	793	1	3
Verified	2020-04-17	Oliver Kruse	E62CA18111138404	2	672	5	3
Verified	2020-08-12	_p95holder_	E62CA18111138404	2	757	5	3

History

Date	User	Type	Result
2021-07-19	ViliamF	NF-PP1	Start=2/7, B1=1000000000, B2=221000000000
2021-03-27	nordi	NF-PM1	B1=1000000000000, B2=2232843418649129478
2020-08-12	_p95holder_	C-PRP	M1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : E62CA18111138404 PRP: Verified PRP without proof (small exponent)
2020-04-17	Oliver Kruse	C-PRP	M1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : E62CA18111138404 PRP: Verified PRP without proof (small exponent)
2017-10-12	kkmrkkblmbrbk	C-PRP	M1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : EBCA1555A98ECAF7 PRP: Verified PRP without proof (not generated)
2017-10-09	Chang Chia-Tche	C-PRP	M1259/known_factors : EBCA1555A98ECAF7 PRP: Verified PRP without proof (not generated)
2017-09-27	Oliver Kruse	C-PRP	M1259/875965965904153/12837801903260418659222502180271368969172790209999210831 : EBCA1555A98ECAF7 PRP: Verified PRP without proof (not generated)
2017-09-25	csaba	C-PRP	M1259/known_factors : EBCA1555A98ECAF7 PRP without proof (not generated)
2016-09-07	kkmrkkblmbrbk	NF-PM1	B1=1000000000, B2=100000000000, E=12
2014-05-21	-Anonymous-	F-ECM	Factor: 12837801903260418659222502180271368969172790209999210831