39 655 643 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 2⁷²

P-1

B1 =	1500000
B2 =	45000000

Status	Date	User	Residue	Shift	Software
Bad	2008-05-22	Grey Smith	A9AFA495B59B6827	38580945	Windows,Prime95,v23,(aka WZ1)
Verified	2017-03-29	Dubslow	7FFF578FF019CF49	38158597	Linux 64-bit,Prime95,v28.7,build 1
Verified	2017-03-31	S485122	7FFF578FF019CF49	11909597	Windows 64-bit,Prime95,v29.1,build 14

History

Date	User	Type	Result
2021-05-15	-anonymous-	NF	no factor TF: 74-75
2021-04-08	Sid & Andy	NF-PM1	B1=1500000, B2=45000000
2020-02-22	-anonymous-	NF	no factor TF: 73-74
2019-10-18	-anonymous-	NF	no factor TF: 72-73
2019-07-07	monst	NF	no factor TF: 71-72
2017-03-31	S485122	C-LL	7FFF578FF019CF49
2017-03-29	Dubslow	C-LL	7FFF578FF019CF49
2014-12-14	megavink	NF	no factor TF: 70-71
2014-12-14	megavink	NF	no factor TF: 69-70
2008-05-21	Grey Smith	C-LL	A9AFA495B59B6827
2008-03-11	Grey Smith	NF-PM1	B1=375000, B2=2906250
2008-03-05	Grey Smith	NF	no factor TF: 1-69
2007-04-07	EPF	NF	no factor TF: 1-68
2002-02-17	Joss	NF	no factor TF: 1-57
2001-01-28	Joss	NF	no factor TF: 1-56