40 008 821 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 =	480000
B2 =	12000000

Status	Date	User	Residue	Shift	Software
Verified	2008-04-25	Ernst W. Mayer	A6176A69988254C3	8687229	Windows,Prime95,v25 beta,(aka Wd1)
Verified	2017-05-13	Dubslow	A6176A69988254C3	17400744	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2020-02-28	-anonymous-	NF	no factor TF: 73-74
2019-10-04	-anonymous-	NF	no factor TF: 72-73
2017-05-13	Dubslow	C-LL	A6176A69988254C3
2014-12-30	ktony	NF	no factor TF: 71-72
2014-11-25	srow7	NF	no factor TF: 70-71
2014-11-23	Architects Cubed	NF	no factor TF: 69-70
2013-10-17	Le Comte	NF	no factor TF: 68-69
2010-10-19	Commaster	NF-PM1	B1=480000, B2=12000000, E=6
2006-11-28	-anonymous-	NF	no factor TF: 1-68
2003-11-16	-anonymous-	NF	no factor TF: 1-61
2000-12-31	Joss	NF	no factor TF: 1-60