40 405 793 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 2⁷³

TF target 2⁷²

P-1

B1 =	1000000
B2 =	20000000

Status	Date	User	Residue	Shift	Software
Bad	2008-07-12	C. Cooper / S. Boone	A5E213FC196AD2A4	32801336	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2015-10-10	Doug Rhea	CFDC151C299FD132	32912928	Windows,Prime95,v28.7,build 1
Verified	2016-06-13	AirSquirrels	CFDC151C299FD132	34408477	CUDALucas v2.05.1

History

Date	User	Type	Result
2019-04-24	Sid & Andy	NF-PM1	B1=1000000, B2=20000000, E=12
2019-03-16	Random GPUs	NF	no factor TF: 72-73
2016-06-13	AirSquirrels	C-LL	CFDC151C299FD132
2015-10-10	Doug Rhea	C-LL	CFDC151C299FD132
2015-03-26	Gordon Spence	NF	no factor TF: 71-72
2014-12-22	The Mawn	NF	no factor TF: 70-71
2014-12-22	The Mawn	NF	no factor TF: 69-70
2008-07-12	curtisc	C-LL	A5E213FC196AD2A4
2008-04-24	curtisc	NF-PM1	B1=595000
2007-04-07	iPrime	NF	no factor TF: 1-69