31 219 961 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 2⁷¹

P-1

B1 =	370000
B2 =	7862500

Status	Date	User	Residue	Shift	Software
Verified	2006-10-01	Elior Segev	31F911395304B361	23959403	Windows,Prime95,v24 final,(aka Wc1)
Verified	2013-05-16	-anonymous-	31F911395304B361	8045108	Windows 64-bit,Prime95,v26.6,build 3

History

Date	User	Type	Result
2021-10-04	TheJudger	NF	no factor TF: 74-75
2020-04-01	-anonymous-	NF	no factor TF: 73-74
2019-12-20	-anonymous-	NF	no factor TF: 71-72
2019-12-20	-anonymous-	NF	no factor TF: 72-73
2018-11-07	ramgeis	NF	no factor TF: 70-71
2013-05-16	-anonymous-	C-LL	31F911395304B361
2013-02-13	bcp19	NF	no factor TF: 69-70
2012-06-28	kracker	NF	no factor TF: 68-69
2011-06-05	Ungelovende	NF	no factor TF: 67-68
2006-10-01	-anonymous-	C-LL	31F911395304B361
2006-07-10	-anonymous-	NF-PM1	B1=370000, B2=7862500
2005-10-04	Team Prime Rib	NF	no factor TF: 1-67
2003-07-06	-anonymous-	NF	no factor TF: 1-59
2003-06-06	Joss	NF	no factor TF: 1-58
2001-08-31	Net_Force	NF	no factor TF: 1-56
2001-01-14	Joss	NF	no factor TF: 1-52