41 501 191 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 =	9215000

Status	Date	User	Residue	Shift	Software
Bad	2008-06-14	LookAS	E631B35FCC88464F	5603569	Windows 64-bit,Prime95,v25 beta,(aka Wd4)
Verified	2015-07-30	Architects Cubed	DCF0473762E861CC	1997278	Linux 64-bit,Prime95,v27.9,build 1
Verified	2016-10-19	Mark Rose	DCF0473762E861CC	9081026	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2024-08-16	tbusby	NF	no factor TF: 71-72
2020-01-10	-anonymous-	NF	no factor TF: 73-74
2019-10-06	-anonymous-	NF	no factor TF: 72-73
2016-10-19	Mark Rose	C-LL	DCF0473762E861CC
2015-07-30	Architects Cubed	NF	no factor TF: 71-72
2015-07-30	Architects Cubed	C-LL	DCF0473762E861CC
2015-01-29	srow7	NF	no factor TF: 70-71
2015-01-24	Numberwang	NF	no factor TF: 69-70
2014-02-14	LaurV	NF	no factor TF: 68-69
2008-06-13	LookAS	C-LL	E631B35FCC88464F
2007-12-31	-anonymous-	NF-PM1	B1=485000, B2=9215000
2007-04-07	Team Prime Rib	NF	no factor TF: 1-68