42 014 587 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 2⁷³

TF target 2⁷²

P-1

B1 =	555000
B2 =	11238750

Status	Date	User	Residue	Shift	Software
Verified	2008-06-03	Scott Kurowski	4448BD024814C238	32817626	Linux 32-bit,Prime95,v24 final,(aka Wc2)
Verified	2017-09-17	Dubslow	4448BD024814C238	23840031	Linux 64-bit,Prime95,v28.7,build 1

History

Date	User	Type	Result
2018-10-21	Architects Cubed	NF-PM1	B1=555000, B2=11238750, E=12
2018-08-10	-anonymous-	NF	no factor TF: 72-73
2017-09-17	Dubslow	C-LL	4448BD024814C238
2015-09-11	AirSquirrels	NF	no factor TF: 71-72
2015-02-24	David Campeau	NF	no factor TF: 70-71
2015-01-14	chalsall	NF	no factor TF: 69-70
2013-12-13	Torben K.	NF	no factor TF: 68-69
2008-06-02	Amperio	C-LL	4448BD024814C238
2008-04-24	Amperio	NF-PM1	B1=695000
2007-05-12	1997rj7	NF	no factor TF: 1-68
2002-06-02	Net_Force	NF	no factor TF: 1-60