66 840 559 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 =	645000
B2 =	13706250

Status	Date	User	Residue	Shift	Software
Verified	2015-06-02	Kyle Z Schmidt	528140841B5A9347	23888721	Windows 64-bit,Prime95,v28.5,build 2
Verified	2024-01-01	S147127	528140841B5A9347	9224096	Windows 64-bit,Prime95,v30.8,build 17

History

Date	User	Type	Result
2024-01-01	S147127	C-LL	528140841B5A9347
2015-06-02	Kyle Z Schmidt	C-LL	528140841B5A9347
2015-04-26	TheJudger	NF	no factor TF: 74-75
2014-09-09	Bdot	NF	no factor TF: 73-74
2014-08-31	TheJudger	NF-PM1	B1=645000, B2=13706250, E=12
2014-04-05	kdgehman	NF	no factor TF: 72-73
2014-04-05	kdgehman	NF	no factor TF: 71-72
2013-04-30	NoPa	NF	no factor TF: 70-71
2012-02-11	Sergey Nosov	NF	no factor TF: 69-70
2010-01-14	PVasilev	NF	no factor TF: 68-69
2010-01-09	Sturle Sunde	NF	no factor TF: 67-68
2010-01-06	Sturle Sunde	NF	no factor TF: 66-67
2010-01-04	Dr. Nowak	NF	no factor TF: 65-66
2009-12-21	Dr. Nowak	NF	no factor TF: 64-65
2009-04-27	1997rj7	NF	no factor TF: 1-64