66 984 571 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 =	13383750

Status	Date	User	Residue	Shift	Software
Verified	2015-03-29	Kyle Z Schmidt	FFED83F620B3D155	14180433	Windows 64-bit,Prime95,v28.5,build 2
Verified	2023-04-25	Ryan Propper	FFED83F620B3D155	45464559	Linux 64-bit,Prime95,v30.7,build 9

History

Date	User	Type	Result
2023-04-25	Ryan Propper	C-LL	FFED83F620B3D155
2020-12-29	chuenkit	NF	no factor TF: 74-75
2015-03-29	Kyle Z Schmidt	C-LL	FFED83F620B3D155
2014-12-02	monaghanrl	NF	no factor TF: 73-74
2014-04-20	Superbob	NF-PM1	B1=645000, B2=13383750, E=6
2014-04-13	TheJudger	NF	no factor TF: 72-73
2014-04-13	TheJudger	NF	no factor TF: 71-72
2012-07-14	Clown_Royal	NF	no factor TF: 70-71
2012-02-29	-anonymous-	NF	no factor TF: 69-70
2010-06-28	arnaud	NF	no factor TF: 68-69
2010-06-24	PVasilev	NF	no factor TF: 67-68
2010-02-17	BroadoakMathsClub	NF	no factor TF: 66-67
2010-02-13	-anonymous-	NF	no factor TF: 65-66
2010-02-09	Choi4KANG	NF	no factor TF: 64-65
2009-06-22	1997rj7	NF	no factor TF: 63-64