42 853 367 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 =	715000
B2 =	715000

Status	Date	User	Residue	Shift	Software
Bad	2008-05-11	Clayton Smith	34CCD8E6927DA15B	35805250	Windows,Prime95,v24 final,(aka Wc1)
Verified	2015-10-09	George Woltman	F7FB4A16A3BBE012	29519588	Windows 64-bit,Prime95,v28.6,build 1
Verified	2016-09-13	Mark Rose	F7FB4A16A3BBE012	4444305	Linux 64-bit,Prime95,v28.9,build 2

History

Date	User	Type	Result
2024-06-18	James Heinrich	NF	no factor TF: 69-70
2018-12-02	Random GPUs	NF	no factor TF: 72-73
2016-09-13	Mark Rose	C-LL	F7FB4A16A3BBE012
2015-10-09	George Woltman	C-LL	F7FB4A16A3BBE012
2015-08-02	tigreroars	NF	no factor TF: 71-72
2015-04-18	Mark Rose	NF	no factor TF: 70-71
2015-02-22	Carsten Kossendey	NF	no factor TF: 69-70
2013-12-29	LaurV	NF	no factor TF: 68-69
2008-05-10	argilo	C-LL	34CCD8E6927DA15B
2008-04-07	argilo	NF-PM1	B1=715000
2007-07-24	smintheus	NF	no factor TF: 1-68