2 997 439 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
231515377368258345863	21	67.6	2016-09-15 01:01:28

ECM

Digits	B1	Curves
25	50000	64 / 280

Estimated T-Level: 21.1 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Roger Smith	E32703BA069CB9AC	0
Verified (Factored)	1999-06-26	Larry Leitch	E32703BA069CB9AC	77340

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-27	Oliver Kruse	7416C68E404D1151	1	2241515	5	3
Verified	2017-12-10	kkmrkkblmbrbk	7416C68E404D1151	1	1984702	5	3

P-1 factors

Date	Factor	B1	B2
2016-09-15	231515377368258345863	140000	2631750

History

Date	User	Type	Result
2023-02-28	USAFSS	NF-PM1	B1=320000, B2=242189310
2017-12-10	kkmrkkblmbrbk	C-PRP	M2997439/231515377368258345863 : 7416C68E404D1151 PRP: Verified PRP without proof (not generated)
2017-10-27	Oliver Kruse	C-PRP	M2997439/231515377368258345863 : 7416C68E404D1151 PRP: Verified PRP without proof (not generated)
2016-09-15	Joss	F-PM1	Factor: 231515377368258345863 / (P-1, B1=140000, B2=2631750, E=6)
2016-02-24	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-02	lycorn	NF	no factor from 2^64 to 2^65
2015-02-02	lycorn	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-11-27	markr	NF	no factor from 2^61 to 2^62
2010-10-20	markr	NF-PM1	B1=110000, B2=2392500, E=6
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61