49 873 643 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 2⁷⁵

TF target 2⁷³

P-1

B1 =	555000
B2 =	13320000

Status	Date	User	Residue	Shift	Software
Verified	2010-10-10	Kyle Z Schmidt	1E4D226251311BED	2066917	Windows,Prime95,v25.9,build 4
Verified	2018-06-26	-anonymous-	1E4D226251311BED	43298092	Windows 64-bit,Prime95,v29.4,build 8

History

Date	User	Type	Result
2019-12-09	Sid & Andy	NF	no factor TF: 74-75
2019-07-02	-anonymous-	NF	no factor TF: 73-74
2018-06-26	-anonymous-	C-LL	1E4D226251311BED
2018-01-19	Mark Rose	NF	no factor TF: 72-73
2015-12-06	-anonymous-	NF	no factor TF: 71-72
2015-05-14	Mark Rose	NF	no factor TF: 70-71
2010-10-10	Kyle Z Schmidt	C-LL	1E4D226251311BED
2010-04-23	Kyle Z Schmidt	NF-PM1	B1=555000, B2=13320000
2008-09-23	-anonymous-	NF	no factor TF: 1-70