7 151 609 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 2⁶⁹

TF target 2⁶⁷

Factored

Factor	Digits	Bits	Date
529536769216599634151	21	68.8	2020-05-22 08:18:14

ECM

Digits	B1	Curves
25	50000	6 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift	Software
Factored	1999-05-02	Gloria D. Greiner-Schnippel	717C82B0E317ADA4	3418714	Windows,Prime95,v18,(aka WU1)
Factored	2001-11-24	Greenlee Brittenum	717C82B0E317ADA4	4003603	Windows,Prime95,v21,(aka WX1)

Status	Proof	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	PRP without proof (not generated)	2020-05-23	Klaus Nordmann	78E654208516FE7D	1	4939581	5	3
Verified	PRP without proof (not generated)	2020-05-25	arnaud	78E654208516FE7D	1	6039355	5	3

History

Date	User	Type	Result
2025-10-05	Sid & Andy	NF-PM1	B1=2600000, B2=4510734690
2020-05-25	arnaud	C-PRP	M7151609/529536769216599634151 : 78E654208516FE7D
2020-05-23	Klaus Nordmann	C-PRP	M7151609/529536769216599634151 : 78E654208516FE7D
2020-05-22	TJAOI	F	Factor: 529536769216599634151 / TF: 68-69
2018-07-24	ramgeis	NF	no factor TF: 67-68
2016-10-24	Gordon Spence	NF	no factor TF: 66-67
2015-06-21	VictordeHollander	NF	no factor TF: 65-66
2014-02-05	lycorn	NF	no factor TF: 64-65
2014-02-02	Nesowa	NF	no factor TF: 63-64
2011-12-22	James Heinrich	NF-PM1	B1=135000, B2=2936250, E=6
2001-11-24	-anonymous-	C-LL	717C82B0E317ADA4
2001-11-14	-anonymous-	NF-PM1	B1=40000, B2=570000
2001-11-14	-anonymous-	NF	no factor TF: 1-63
1999-05-02	-anonymous-	C-LL	717C82B0E317ADA4
1998-09-20	-anonymous-	NF	no factor TF: 1-62
1998-08-16	-anonymous-	NF	no factor TF: 1-62