31 249 993 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 =	1000000
B2 =	30000000

Status	Date	User	Residue	Shift	Software
Bad	2006-10-24	Dave Hart	BB275DDB9C245F54	9947466	Windows,Prime95,v23,(aka WZ1)
Verified	2007-05-28	Mike Ellis	B3BD94BEFC4EE062	12251754	Windows,Prime95,v24 final,(aka Wc1)
Verified	2013-05-21	-anonymous-	B3BD94BEFC4EE062	12602370	Windows,Prime95,v27.7,build 1

History

Date	User	Type	Result
2021-10-04	TheJudger	NF	no factor TF: 74-75
2021-09-14	Sid & Andy	NF-PM1	B1=1000000, B2=30000000
2020-04-09	-anonymous-	NF	no factor TF: 73-74
2019-12-20	-anonymous-	NF	no factor TF: 72-73
2019-12-20	-anonymous-	NF	no factor TF: 71-72
2018-12-19	ramgeis	NF	no factor TF: 70-71
2013-05-21	-anonymous-	C-LL	B3BD94BEFC4EE062
2013-02-21	apsen	NF	no factor TF: 69-70
2012-06-30	kracker	NF	no factor TF: 68-69
2007-05-28	-anonymous-	C-LL	B3BD94BEFC4EE062
2006-10-24	-anonymous-	C-LL	BB275DDB9C245F54
2006-07-25	-anonymous-	NF	no factor TF: 1-68
2006-07-25	-anonymous-	NF-PM1	B1=475000
2005-11-27	sannerud.com	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