81 574 231 Exponent Status

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

PrimeNet Exponent Status

M_n

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁵

TF target 2⁷⁵

P-1

B1 =	730000
B2 =	14600000

Status	Date	User	Residue	Shift	Software
Verified	2017-09-23	curtisc	629D9FEC5FE071B9	25006704	Windows Service,Prime95,v28.7,build 1
Verified	2025-10-09	-anonymous-	629D9FEC5FE071B9	79711668	Windows,Prime95,v28.6,build 1

History

Date	User	Type	Result
2025-10-09	-anonymous-	C-LL	629D9FEC5FE071B9
2017-09-23	curtisc	C-LL	629D9FEC5FE071B9
2017-05-13	James Heinrich	NF-PM1	B1=730000, B2=14600000, E=6
2016-11-06	TheJudger	NF	no factor TF: 74-75
2016-11-06	TheJudger	NF	no factor TF: 73-74
2016-10-09	Son Johan	NF	no factor TF: 72-73
2014-01-09	SWL551	NF	no factor TF: 71-72
2013-07-11	PascalBieri	NF	no factor TF: 70-71
2013-06-10	g0b	NF	no factor TF: 69-70
2013-06-07	g0b	NF	no factor TF: 68-69
2013-02-03	CLICHE	NF	no factor TF: 67-68
2013-01-30	phoenicis	NF	no factor TF: 66-67
2011-04-17	-anonymous-	NF	no factor TF: 65-66
2010-12-13	Architects Cubed	NF	no factor TF: 64-65