48 531 139 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 =	535000
B2 =	9095000

Status	Date	User	Residue	Shift	Software
Bad	2010-06-13	Jeff_Gilchrist	5BF9D3FFBEA4F55F	20612353	Windows Service,Prime95,v25.11,build 2
Verified	2011-07-12	curtisc	85CC24AD42332775	39573110	Windows Service,Prime95,v26.5,build 5
Verified	2016-08-29	AirSquirrels	85CC24AD42332775	0	clLucas v1.04

History

Date	User	Type	Result
2018-02-25	monst	NF	no factor TF: 72-73
2016-08-29	AirSquirrels	C-LL	85CC24AD42332775
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	Sid & Andy	NF	no factor TF: 69-70
2011-07-12	curtisc	C-LL	85CC24AD42332775
2010-06-13	Jeff_Gilchrist	C-LL	5BF9D3FFBEA4F55F
2010-03-24	Jeff_Gilchrist	NF-PM1	B1=535000, B2=9095000
2008-05-21	JC_Herles	NF	no factor TF: 1-69
2007-12-18	1997rj7	NF	no factor TF: 1-63
2003-06-06	Thomas Mullen	NF	no factor TF: 1-59