40 775 263 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 =	395000
B2 =	2073750

Status	Date	User	Residue	Shift	Software
Bad	2008-09-16	C. Cooper / S. Boone	2AFD3558A0644A21	39216346	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2010-09-20	g0b	7F2AC5DD8C97A2DC	36719538	Windows,Prime95,v25.9,build 4
Verified	2016-06-04	AirSquirrels	7F2AC5DD8C97A2DC	3118623	CUDALucas v2.05.1

History

Date	User	Type	Result
2019-10-05	-anonymous-	NF	no factor TF: 72-73
2016-06-04	AirSquirrels	C-LL	7F2AC5DD8C97A2DC
2015-05-31	TheJudger	NF	no factor TF: 71-72
2015-01-04	megavink	NF	no factor TF: 70-71
2015-01-04	megavink	NF	no factor TF: 69-70
2013-11-18	VictordeHollander	NF	no factor TF: 68-69
2010-09-20	g0b	C-LL	7F2AC5DD8C97A2DC
2008-09-06	curtisc	C-LL	2AFD3558A0644A21
2008-07-25	curtisc	NF-PM1	B1=395000, B2=2073750
2007-02-05	Gerry Snyder	NF	no factor TF: 1-68