49 812 649 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 2⁷⁴

TF target 2⁷³

P-1

B1 =	590000
B2 =	15930000

Status	Date	User	Residue	Shift	Software
Verified	2011-02-20	WR	B5FFB0417793B36B	25726846	Linux 64-bit,Prime95,v25.11,build 2
Verified	2019-12-26	Dubslow	B5FFB0417793B36B	28691314	Linux 64-bit,Prime95,v29.8,build 6

History

Date	User	Type	Result
2019-12-26	Dubslow	C-LL	B5FFB0417793B36B
2019-07-02	-anonymous-	NF	no factor TF: 73-74
2017-11-28	monst	NF	no factor TF: 72-73
2015-12-06	-anonymous-	NF	no factor TF: 71-72
2015-06-14	LaurV	NF	no factor TF: 70-71
2015-06-12	LaurV	NF	no factor TF: 69-70
2011-02-20	WR	C-LL	B5FFB0417793B36B
2011-01-01	WR	NF-PM1	B1=590000, B2=15930000, E=12
2008-09-06	ITS	NF	no factor TF: 1-69