68 257 559 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 2⁷⁴

P-1

B1 =	625000
B2 =	12812500

Status	Date	User	Residue	Shift	Software
Verified	2016-01-16	Kyle Z Schmidt	B4C48F031552F0F9	23199587	Windows 64-bit,Prime95,v28.5,build 2
Verified	2024-04-06	James Carlson	B4C48F031552F0F9	19031974	Linux 64-bit,Prime95,v30.8,build 18

History

Date	User	Type	Result
2024-06-01	LaurV	NF	no factor TF: 70-71
2024-04-06	James Carlson	C-LL	B4C48F031552F0F9
2016-01-16	Kyle Z Schmidt	C-LL	B4C48F031552F0F9
2015-12-23	ktony	NF	no factor TF: 74-75
2014-08-10	TheJudger	NF-PM1	B1=625000, B2=12812500, E=12
2014-07-31	The Mawn	NF	no factor TF: 73-74
2014-07-20	Bdot	NF	no factor TF: 72-73
2014-07-10	RichD0	NF	no factor TF: 71-72
2013-10-11	Carsten Kossendey	NF	no factor TF: 70-71
2013-04-30	timc995	NF	no factor TF: 69-70
2010-04-09	dmbeeson	NF	no factor TF: 68-69
2010-01-21	Jonathan Crombie	NF	no factor TF: 67-68
2010-01-16	unconnected	NF	no factor TF: 66-67
2010-01-15	Sturle Sunde	NF	no factor TF: 65-66
2010-01-13	marvik	NF	no factor TF: 64-65
2008-10-27	1997rj7	NF	no factor TF: 1-64