48 648 199 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	2010-07-17	curtisc	98E6EDF4CF805B1B	43489322	Windows Service,Prime95,v25.11,build 2
Verified	2010-09-11	-anonymous-	EC73EB76B801BF5D	5113155	Windows 64-bit,Prime95,v25.9,build 4
Verified	2016-08-26	AirSquirrels	EC73EB76B801BF5D	0	clLucas v1.04

History

Date	User	Type	Result
2018-02-06	Mark Rose	NF	no factor TF: 72-73
2016-08-26	AirSquirrels	C-LL	EC73EB76B801BF5D
2015-08-23	ktony	NF	no factor TF: 71-72
2015-08-23	ktony	NF	no factor TF: 70-71
2015-08-13	Gordon Spence	NF	no factor TF: 69-70
2010-09-11	-anonymous-	C-LL	EC73EB76B801BF5D
2010-08-11	-anonymous-	NF-PM1	B1=560000, B2=13440000
2010-07-17	curtisc	C-LL	98E6EDF4CF805B1B
2008-06-02	GrunwalderGIMP	NF	no factor TF: 1-69
2007-12-03	1997rj7	NF	no factor TF: 1-63
2003-06-06	Thomas Mullen	NF	no factor TF: 1-59