2 157 007 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
257486897759052525457	21	67.8	2013-04-27 23:56:35

ECM

Digits	B1	Curves
25	50000	97 / 280

Estimated T-Level: 21.7 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		John Lloyd	F03D9411882E792F	0
Verified (Factored)	1999-02-07	Roger Smith	F03D9411882E792F	1406176

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-08	Oliver Kruse	2A65E460336E1AF5	1	0	1	3
Verified	2017-11-18	kkmrkkblmbrbk	2A65E460336E1AF5	1	1472179	1	3

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2017-11-18	kkmrkkblmbrbk	C-PRP	M2157007/257486897759052525457 : 2A65E460336E1AF5 PRP: Verified PRP without proof (not generated)
2017-10-08	Oliver Kruse	C-PRP	M2157007/257486897759052525457 : 2A65E460336E1AF5 PRP: Verified PRP without proof (not generated)
2016-03-29	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2013-04-27	Xyzzy	F-ECM	Factor: 257486897759052525457
2011-01-24	markr	NF-PM1	B1=120000, B2=2340000, E=6
2010-11-10	Joss	NF-PM1	B1=60000
2010-11-07	Joss	NF-PM1	B1=45000
2010-11-07	Joss	NF-PM1	B1=30000
2010-11-04	Joss	NF-PM1	B1=15000
2009-01-07	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-04	Sturle Sunde	NF	no factor from 2^60 to 2^61