31 178 417 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 2⁷¹

P-1

B1 =	445000
B2 =	9011250

Status	Date	User	Residue	Shift	Software
Verified	2006-05-29	Joseph Charrier	FE897FEC6503C411	29737240	Windows,Prime95,v23,(aka WZ1)
Verified	2014-01-10	Dubslow	FE897FEC6503C411	24006239	Linux 64-bit,Prime95,v26,(aka We8)

History

Date	User	Type	Result
2022-10-14	Sid & Andy	NF	no factor TF: 72-73
2018-09-24	Architects Cubed	NF	no factor TF: 71-72
2018-08-04	Architects Cubed	NF-PM1	B1=445000, B2=9011250, E=12
2018-07-08	ramgeis	NF	no factor TF: 70-71
2014-01-10	Dubslow	C-LL	FE897FEC6503C411
2013-02-11	David Campeau	NF	no factor TF: 69-70
2012-06-15	bcp19	NF	no factor TF: 68-69
2006-05-29	-anonymous-	C-LL	FE897FEC6503C411
2006-04-14	-anonymous-	NF	no factor TF: 1-68
2006-04-14	-anonymous-	NF-PM1	B1=445000
2005-09-22	TheJudger	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