48 685 183 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 =	800000
B2 =	16000000

Status	Date	User	Residue	Shift	Software
Bad	2010-08-20	-anonymous-	9E47B30C18D688A4	22524281	Windows,Prime95,v25.7,build 1
Verified	2011-04-02	CoffmanA	A93F5B71F448CA02	40719305	Windows,Prime95,v25.8,build 5
Verified	2016-08-20	AirSquirrels	A93F5B71F448CA02	8800577	CUDALucas v2.05.1

History

Date	User	Type	Result
2019-01-13	Sid & Andy	NF-PM1	B1=800000, B2=16000000, E=6
2017-12-18	Sid & Andy	NF	no factor TF: 72-73
2016-08-20	AirSquirrels	C-LL	A93F5B71F448CA02
2015-08-23	ktony	NF	no factor TF: 71-72
2015-08-23	ktony	NF	no factor TF: 70-71
2015-08-10	Gordon Spence	NF	no factor TF: 69-70
2011-04-02	CoffmanA	C-LL	A93F5B71F448CA02
2010-08-20	-anonymous-	C-LL	9E47B30C18D688A4
2010-04-08	-anonymous-	NF-PM1	B1=765000
2008-06-22	tsc	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