31 178 447 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 =	420000
B2 =	8085000

Status	Date	User	Residue	Shift	Software
Verified	2006-03-01	Prime Diggers	455D2722E83F8559	19495787	Windows,Prime95,v24 final,(aka Wc1)
Verified	2014-01-10	Dubslow	455D2722E83F8559	26973634	Linux 64-bit,Prime95,v26,(aka We8)

History

Date	User	Type	Result
2022-10-14	Sid & Andy	NF	no factor TF: 72-73
2018-09-12	Architects Cubed	NF-PM1	B1=420000, B2=8085000, E=12
2018-09-04	Architects Cubed	NF	no factor TF: 71-72
2018-08-06	Architects Cubed	NF	no factor TF: 70-71
2014-01-10	Dubslow	C-LL	455D2722E83F8559
2013-02-11	David Campeau	NF	no factor TF: 69-70
2012-06-16	bcp19	NF	no factor TF: 68-69
2011-06-02	Ungelovende	NF	no factor TF: 67-68
2006-03-01	-anonymous-	C-LL	455D2722E83F8559
2006-01-15	-anonymous-	NF-PM1	B1=510000
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