48 657 031 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 2⁷²

P-1

B1 =	560000
B2 =	13440000

Status	Date	User	Residue	Shift	Software
Bad	2010-05-14	Eugene Chertok	600343BD29AFC3CF	25929894	Windows,Prime95,v25.8,build 5
Verified	2011-03-08	curtisc	6DE29042244E60AB	5832086	Windows Service,Prime95,v25.11,build 2
Verified	2016-08-27	AirSquirrels	6DE29042244E60AB	0	clLucas v1.04

History

Date	User	Type	Result
2018-02-06	Mark Rose	NF	no factor TF: 72-73
2016-08-27	AirSquirrels	C-LL	6DE29042244E60AB
2016-02-23	Mark Rose	NF	no factor TF: 63-64
2015-08-16	Sid & Andy	NF	no factor TF: 71-72
2015-08-09	Mark Rose	NF	no factor TF: 70-71
2015-07-24	Gordon Spence	NF	no factor TF: 69-70
2011-03-08	curtisc	C-LL	6DE29042244E60AB
2010-05-14	Eugene Chertok	C-LL	600343BD29AFC3CF
2010-04-03	Eugene Chertok	NF-PM1	B1=560000, B2=13440000
2008-06-13	Mike Curtis	NF	no factor TF: 68-69
2008-06-13	Mike Curtis	NF	no factor TF: 65-66
2008-06-13	Mike Curtis	NF	no factor TF: 64-65
2008-06-13	Mike Curtis	NF	no factor TF: 66-67
2008-06-13	Mike Curtis	NF	no factor TF: 67-68
2007-12-03	1997rj7	NF	no factor TF: 1-63
2003-06-06	Thomas Mullen	NF	no factor TF: 1-59