40 025 747 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 2⁷⁴

TF target 2⁷²

P-1

B1 =	485000
B2 =	13337500

Status	Date	User	Residue	Shift	Software
Verified	2009-01-20	-anonymous-	2FAE8DCC3219AB5E	5054916	Windows,Prime95,v24 final,(aka Wc1)
Verified	2016-10-13	ANONYMOUS	2FAE8DCC3219AB5E	846411	Windows 64-bit,Prime95,v28.5,build 2

History

Date	User	Type	Result
2020-02-21	-anonymous-	NF	no factor TF: 73-74
2019-10-04	-anonymous-	NF	no factor TF: 72-73
2016-10-13	ANONYMOUS	C-LL	2FAE8DCC3219AB5E
2014-12-29	Gordon Spence	NF	no factor TF: 71-72
2014-11-26	srow7	NF	no factor TF: 70-71
2014-11-26	srow7	NF	no factor TF: 69-70
2013-10-20	Torben K.	NF	no factor TF: 68-69
2009-01-20	Kenneth Witt	C-LL	2FAE8DCC3219AB5E
2008-04-03	-anonymous-	NF-PM1	B1=485000, B2=13337500, E=6
2006-11-28	-anonymous-	NF	no factor TF: 1-68
2003-11-16	-anonymous-	NF	no factor TF: 1-61