49 383 371 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 =	565000
B2 =	12288750

Status	Date	User	Residue	Shift	Software
Bad	2010-09-10	arnaud	C3A27284B5E67B59	17112570	Windows Service,Prime95,v25.11,build 2
Verified	2016-02-08	Greg	E0EF8201588A010E	29036458	CUDALucas v2.05 Beta
Verified	2016-09-07	endless_mike	E0EF8201588A010E	21280985	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2019-07-06	-anonymous-	NF	no factor TF: 73-74
2017-09-24	-anonymous-	NF	no factor TF: 72-73
2016-09-07	endless_mike	C-LL	E0EF8201588A010E
2016-02-08	Greg	C-LL	E0EF8201588A010E
2015-12-17	AirSquirrels	NF	no factor TF: 71-72
2015-12-17	AirSquirrels	NF	no factor TF: 70-71
2015-08-26	Sid & Andy	NF	no factor TF: 69-70
2010-09-10	arnaud	C-LL	C3A27284B5E67B59
2010-07-30	arnaud	NF-PM1	B1=565000, B2=12288750
2008-08-07	GrunwalderGIMP	NF	no factor TF: 1-69
2008-06-03	-anonymous-	NF	no factor TF: 1-64
2007-08-14	1997rj7	NF	no factor TF: 1-63
2003-11-08	Team Prime Rib	NF	no factor TF: 1-59