81 080 851 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 2⁷⁶

TF target 2⁷⁵

P-1

B1 =	715000
B2 =	14478750

Status	Date	User	Residue	Shift	Software
Verified	2018-09-12	curtisc	E7A617399FD59C5E	9634874	Windows Service,Prime95,v28.7,build 1
Verified	2026-02-19	ANONYMOUS	E7A617399FD59C5E	33793006	Windows 64-bit,Prime95,v30.19,build 20

History

Date	User	Type	Result
2026-02-19	ANONYMOUS	C-LL	E7A617399FD59C5E
2025-12-07	Sid & Andy	NF	no factor TF: 75-76
2018-09-12	curtisc	C-LL	E7A617399FD59C5E
2017-08-13	Architects Cubed	NF-PM1	B1=715000, B2=14478750, E=6
2016-11-06	TheJudger	NF	no factor TF: 74-75
2016-11-06	TheJudger	NF	no factor TF: 73-74
2012-02-03	Piepen	NF	no factor TF: 72-73
2012-02-03	Piepen	NF	no factor TF: 71-72
2012-02-03	Piepen	NF	no factor TF: 70-71
2012-02-03	Piepen	NF	no factor TF: 69-70
2012-02-03	Piepen	NF	no factor TF: 68-69
2012-02-03	Piepen	NF	no factor TF: 67-68
2012-02-03	Piepen	NF	no factor TF: 66-67
2012-02-03	Piepen	NF	no factor TF: 65-66
2012-02-03	Piepen	NF	no factor TF: 66-73
2010-12-12	Architects Cubed	NF	no factor TF: 64-65