81 456 239 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

Tested as composite (unverified): unconfirmed Lucas-Lehmer test says not-prime

TF

No factors below 2⁷⁶

TF target 2⁷⁵

P-1

B1 =	715000
B2 =	14300000

Status	Date	User	Residue	Shift
Unverified	2017-06-27	Evgeniy Zavialov	C8CD02BADDDEEF__	64542429

Assigned

Assigned	User	Work Type	Stage	% Done	Updated	Expired
2025-04-18	-Anonymous-	LL double-check		0.00 %	2025-04-18

History

Date	User	Type	Result
2020-06-03	-Anonymous-	NF	no factor from 2^75 to 2^76
2017-06-27	Evgeniy Zavialov	C-LL	C8CD02BADDDEEF__
2017-05-17	mansky	NF-PM1	B1=715000, B2=14300000
2016-11-06	TheJudger	NF	no factor from 2^74 to 2^75
2016-11-06	TheJudger	NF	no factor from 2^73 to 2^74
2013-02-03	SWL551	NF	no factor from 2^72 to 2^73
2013-02-03	SWL551	NF	no factor from 2^71 to 2^72
2013-02-03	SWL551	NF	no factor from 2^70 to 2^71
2013-02-03	SWL551	NF	no factor from 2^69 to 2^70
2013-02-03	SWL551	NF	no factor from 2^68 to 2^69
2013-02-03	SWL551	NF	no factor from 2^67 to 2^68
2013-01-30	phoenicis	NF	no factor from 2^66 to 2^67
2012-08-14	Carsten Kossendey	NF	no factor from 2^65 to 2^66
2010-12-13	Architects Cubed	NF	no factor from 2^64 to 2^65