49 421 369 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 =	565000
B2 =	12288750

Status	Date	User	Residue	Shift	Software
Bad	2010-05-11	arnaud	6811E95181C33BED	16889168	Windows Service,Prime95,v25.11,build 2
Verified	2016-02-11	Greg	F39699B99E05486A	14124382	CUDALucas v2.05 Beta
Verified	2016-09-11	endless_mike	F39699B99E05486A	34980256	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2020-12-22	-anonymous-	NF	no factor TF: 74-75
2019-09-12	Jon Pace	NF	no factor TF: 73-74
2017-11-05	monst	NF	no factor TF: 72-73
2016-09-11	endless_mike	C-LL	F39699B99E05486A
2016-02-11	Greg	C-LL	F39699B99E05486A
2015-12-27	AirSquirrels	NF	no factor TF: 71-72
2015-12-27	AirSquirrels	NF	no factor TF: 70-71
2015-08-26	Sid & Andy	NF	no factor TF: 69-70
2010-05-11	arnaud	C-LL	6811E95181C33BED
2010-01-28	arnaud	NF-PM1	B1=565000, B2=12288750
2008-08-07	Team Prime Rib	NF	no factor TF: 1-69
2008-06-03	-anonymous-	NF	no factor TF: 1-64
2007-05-12	1997rj7	NF	no factor TF: 1-63
2003-11-28	Team Prime Rib	NF	no factor TF: 1-59