66 928 387 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 =	14843750

Status	Date	User	Residue	Shift	Software
Verified	2015-06-09	Kyle Z Schmidt	C04C5DC806584F9E	55942659	Windows 64-bit,Prime95,v28.5,build 2
Verified	2023-11-10	billymac00	C04C5DC806584F9E	17449690	Windows 64-bit,Prime95,v30.8,build 17

History

Date	User	Type	Result
2023-11-10	billymac00	C-LL	C04C5DC806584F9E
2015-06-09	Kyle Z Schmidt	C-LL	C04C5DC806584F9E
2015-05-03	TheJudger	NF	no factor TF: 74-75
2014-04-21	owftheevil	NF-PM1	B1=625000, B2=14843750, E=6
2014-04-10	monst	NF	no factor TF: 73-74
2014-04-06	TheJudger	NF	no factor TF: 72-73
2014-04-06	TheJudger	NF	no factor TF: 71-72
2012-07-13	Dr. Nowak	NF	no factor TF: 70-71
2012-02-13	Todd Walke	NF	no factor TF: 69-70
2009-12-28	unconnected	NF	no factor TF: 68-69
2009-12-26	BranMuffin	NF	no factor TF: 67-68
2009-12-15	-anonymous-	NF	no factor TF: 66-67
2009-12-09	Sturle Sunde	NF	no factor TF: 65-66
2009-12-08	Perendie	NF	no factor TF: 64-65
2009-05-31	1997rj7	NF	no factor TF: 1-64