40 673 887 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 =	390000
B2 =	2047500

Status	Date	User	Residue	Shift	Software
Bad	2007-12-18	C. Cooper / S. Boone	DD624D1EDF0EE084	28160365	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2009-01-26	curtisc	945F1660373434F2	6261681	Windows,Prime95,v24 final,NT service,(aka Wc5)
Verified	2016-06-06	AirSquirrels	945F1660373434F2	6821387	CUDALucas v2.05.1

History

Date	User	Type	Result
2024-05-29	mrh	NF	no factor TF: 68-69
2022-04-21	Sid & Andy	NF	no factor TF: 72-73
2016-06-06	AirSquirrels	C-LL	945F1660373434F2
2015-06-01	Mark Rose	NF	no factor TF: 71-72
2014-12-22	chalsall	NF	no factor TF: 70-71
2014-12-22	chalsall	NF	no factor TF: 69-70
2012-10-09	Carsten Kossendey	NF	no factor TF: 68-69
2009-01-26	curtisc	C-LL	945F1660373434F2
2007-12-18	curtisc	C-LL	DD624D1EDF0EE084
2007-10-29	curtisc	NF-PM1	B1=390000, B2=2047500
2007-01-16	korva	NF	no factor TF: 1-68