66 974 377 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 =	645000
B2 =	13706250

Status	Date	User	Residue	Shift	Software
Verified	2015-06-27	Kyle Z Schmidt	1B450AC84E29004C	56584113	Windows 64-bit,Prime95,v28.5,build 2
Verified	2023-04-15	Ryan Propper	1B450AC84E29004C	15967015	Linux 64-bit,Prime95,v30.7,build 9

History

Date	User	Type	Result
2023-04-15	Ryan Propper	C-LL	1B450AC84E29004C
2015-06-27	Kyle Z Schmidt	C-LL	1B450AC84E29004C
2015-05-31	megavink	NF	no factor TF: 74-75
2014-11-24	monaghanrl	NF	no factor TF: 73-74
2014-09-07	TheJudger	NF-PM1	B1=645000, B2=13706250, E=12
2014-04-06	TheJudger	NF	no factor TF: 72-73
2014-04-06	TheJudger	NF	no factor TF: 71-72
2012-07-17	Clown_Royal	NF	no factor TF: 70-71
2012-02-23	Amperio	NF	no factor TF: 69-70
2010-02-13	Aviatorr	NF	no factor TF: 68-69
2010-02-11	Aviatorr	NF	no factor TF: 67-68
2010-02-10	linded	NF	no factor TF: 66-67
2010-02-08	Sturle Sunde	NF	no factor TF: 65-66
2009-12-07	Sturle Sunde	NF	no factor TF: 64-65
2009-06-16	1997rj7	NF	no factor TF: 1-64