40 158 841 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 2⁷⁶

TF target 2⁷²

P-1

B1 =	410000
B2 =	4920000

Status	Date	User	Residue	Shift	Software
Verified	2007-12-18	Andy Kohler	3C4C0521BD667717	27320972	Windows,Prime95,v24 final,(aka Wc1)
Verified	2017-06-22	Dubslow	3C4C0521BD667717	6894708	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2021-03-10	-anonymous-	NF	no factor TF: 75-76
2021-03-07	-anonymous-	NF	no factor TF: 74-75
2020-01-31	-anonymous-	NF	no factor TF: 73-74
2019-10-04	-anonymous-	NF	no factor TF: 72-73
2017-06-22	Dubslow	C-LL	3C4C0521BD667717
2015-01-17	Gordon Spence	NF	no factor TF: 71-72
2014-12-17	NickOfTime	NF	no factor TF: 70-71
2014-12-17	NickOfTime	NF	no factor TF: 69-70
2007-12-18	akohler	C-LL	3C4C0521BD667717
2007-10-29	akohler	NF-PM1	B1=410000, B2=4920000
2006-12-18	JonnyO	NF	no factor TF: 1-69
2006-07-10	-anonymous-	NF	no factor TF: 1-62
2002-08-31	-anonymous-	NF	no factor TF: 1-57