2 260 631 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

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

Trial Factored to 2⁶⁸

TF target 2⁶²

Factored

Factor	Digits	Bits	Date
2498852302510288293551	22	71.1	2016-07-21 12:20:37

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	212 / 640

Estimated T-Level: 26.7 ⓘ

TF below 2^84 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		Bartholomew Barker	7EFD5FEA1F514C8F	0	Windows,Prime95,v14,(aka WQ1)
Factored	1999-08-16	Alexander Kruppa	7EFD5FEA1F514C8F	780020	Windows,Prime95,v18,NT service,(aka WU5)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-10	Oliver Kruse	B3CC73E7265DD187	1	0	1	3
Verified	PRP without proof (not generated)	2017-11-21	storm5510	B3CC73E7265DD187	1	1259525	1	3

History

Date	User	Type	Result
2023-01-28	USAFSS	NF-PM1	B1=288000, B2=308189700
2017-11-21	storm5510	C-PRP	M2260631/2498852302510288293551 : B3CC73E7265DD187
2017-10-10	Oliver Kruse	C-PRP	M2260631/2498852302510288293551 : B3CC73E7265DD187
2016-07-21	bam	F-ECM	Factor: 2498852302510288293551
2016-03-27	Joss	NF-PM1	B1=342144, B2=3421440, E=6
2016-02-23	Mark Rose	NF	no factor TF: 1-60
2015-10-29	ramgeis	NF	no factor TF: 65-66
2015-03-10	VictordeHollander	NF	no factor TF: 64-65
2015-03-10	VictordeHollander	NF	no factor TF: 63-64
2014-09-02	Joss	NF-PM1	B1=128392
2013-12-04	LaurV	NF	no factor TF: 62-63
2012-05-05	Sebastian Hornbostel	NF	no factor TF: 61-62
2011-01-04	markr	NF-PM1	B1=100000, B2=2075000, E=6
2010-11-12	Joss	NF-PM1	B1=30000
2010-11-06	Joss	NF-PM1	B1=15000
2009-01-11	Sturle Sunde	NF	no factor TF: 60-61
1999-08-16	Alex Kruppa	C-LL	7EFD5FEA1F514C8F