26 868 893 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 2⁷⁰

P-1

B1 =	305000
B2 =	4041250

Status	Date	User	Residue	Shift	Software
Bad	2005-04-02	Jean-Michel Basson	25C6378013F94C1B	11420625	Windows,Prime95,v23,(aka WZ1)
Verified	2012-08-03	LaurV	71CE5F0735E6F480	0	CUDALucas v2.04 Beta
Verified	2012-08-06	Dubslow	71CE5F0735E6F480	22500577	Linux 64-bit,Prime95,v27.7,build 2

History

Date	User	Type	Result
2021-10-11	TheJudger	NF	no factor TF: 74-75
2021-09-19	TheJudger	NF	no factor TF: 73-74
2021-08-25	TheJudger	NF	no factor TF: 72-73
2021-08-25	TheJudger	NF	no factor TF: 71-72
2021-05-23	mikr	NF	no factor TF: 70-71
2017-04-08	ramgeis	NF	no factor TF: 69-70
2012-08-06	Dubslow	C-LL	71CE5F0735E6F480
2012-08-03	LaurV	C-LL	71CE5F0735E6F480
2012-03-29	apsen	NF	no factor TF: 68-69
2011-11-01	Chuck	NF	no factor TF: 67-68
2005-04-02	Jean-Michel Basson	C-LL	25C6378013F94C1B
2005-02-12	Jean-Michel Basson	NF-PM1	B1=305000, B2=4041250
2004-12-23	-anonymous-	NF	no factor TF: 1-67
2002-06-02	Joss	NF	no factor TF: 1-57