42 240 043 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 =	410000
B2 =	2152500

Status	Date	User	Residue	Shift	Software
Bad	2008-04-25	C. Cooper / S. Boone	28AACFF730870831	2077573	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2015-08-06	Architects Cubed	91F83DC2B9BC9093	17431246	Linux 64-bit,Prime95,v27.9,build 1
Verified	2016-07-05	Choi4KANG	91F83DC2B9BC9093	30423489	Windows,Prime95,v27.7,build 2

History

Date	User	Type	Result
2022-04-19	RichD0	NF	no factor TF: 72-73
2016-07-05	Choi4KANG	C-LL	91F83DC2B9BC9093
2015-08-06	Architects Cubed	C-LL	91F83DC2B9BC9093
2015-07-26	tigreroars	NF	no factor TF: 71-72
2015-03-06	Mark Rose	NF	no factor TF: 70-71
2015-01-20	Mark Rose	NF	no factor TF: 69-70
2014-01-01	LaurV	NF	no factor TF: 68-69
2008-04-24	curtisc	C-LL	28AACFF730870831
2008-03-11	curtisc	NF-PM1	B1=410000, B2=2152500
2007-05-28	Dk Systems	NF	no factor TF: 1-68