2 258 987 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
130342995475826635721	21	66.8	2011-01-05 07:51:53

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	197 / 640

Estimated T-Level: 26.5 ⓘ

TF below 2^83 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored		Stephen Nichols	6D9CB5289307A297	0	Windows,Prime95,v13,(aka WP1)
Factored	1998-03-17	Dongsheng Liu	6D9CB5289307A297	0	Windows,Prime95,v14,(aka WQ1)
Factored	1999-03-01	Michael Collier	6D9CB5289307A297	461580	Windows,Prime95,v17,(aka WT1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2017-10-10	Oliver Kruse	CFDE968F35A8E306	1	0	1	3
Verified	PRP without proof (not generated)	2017-11-21	storm5510	CFDE968F35A8E306	1	1013648	1	3

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor TF: 1-60
2017-11-21	storm5510	C-PRP	M2258987/130342995475826635721 : CFDE968F35A8E306
2017-10-10	Oliver Kruse	C-PRP	M2258987/130342995475826635721 : CFDE968F35A8E306
2016-04-14	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2011-01-05	markr	F-PM1	Factor: 130342995475826635721
2010-11-12	Joss	NF-PM1	B1=30000
2010-11-06	Joss	NF-PM1	B1=15000
2009-01-12	Sturle Sunde	NF	no factor TF: 60-61
1999-08-16	-anonymous-	C-LL	6D9CB5289307A297
1999-03-01	-anonymous-	C-LL	6D9CB5289307A297
1998-03-17	-anonymous-	NF	no factor TF: 1-58
1998-03-17	-anonymous-	C-LL	6D9CB5289307A297