49 342 991 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 =	575000
B2 =	15525000

Status	Date	User	Residue	Shift	Software
Bad	2011-04-14	Dallas	6B307F2F605FD16C	18400502	Windows 64-bit,Prime95,v25.9,build 4
Verified	2015-09-07	Greg	9D5C98EFD3837190	33928353	CUDALucas v2.05 Beta
Verified	2016-09-06	endless_mike	9D5C98EFD3837190	20840550	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2024-08-16	tbusby	NF	no factor TF: 69-70
2019-07-10	-anonymous-	NF	no factor TF: 73-74
2017-09-09	Sid & Andy	NF	no factor TF: 72-73
2016-09-06	endless_mike	C-LL	9D5C98EFD3837190
2015-09-07	Greg	C-LL	9D5C98EFD3837190
2015-08-07	Mark Rose	NF	no factor TF: 71-72
2015-07-26	Mark Rose	NF	no factor TF: 70-71
2015-07-23	Architects Cubed	NF	no factor TF: 69-70
2011-04-14	Dallas	C-LL	6B307F2F605FD16C
2011-02-11	Dallas	NF-PM1	B1=575000, B2=15525000, E=6
2008-07-25	precius1	NF	no factor TF: 1-69
2008-06-03	-anonymous-	NF	no factor TF: 1-64
2007-07-24	1997rj7	NF	no factor TF: 1-63
2003-11-08	Team Prime Rib	NF	no factor TF: 1-59