40 155 481 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 2⁷⁶

TF target 2⁷²

P-1

B1 =	450000
B2 =	9337500

Status	Date	User	Residue	Shift	Software
Bad	2009-11-07	Wolfgang Steger	D2C321A16039CE82	32542120	Windows Service,Prime95,v25.9,build 4
Verified	2017-06-21	Dubslow	27B0488168AD787A	12183325	Linux 64-bit,Prime95,v28.7,build 1
Verified	2017-06-24	endless_mike	27B0488168AD787A	27430018	Linux 64-bit,Prime95,v28.10,build 1

History

Date	User	Type	Result
2021-03-12	-anonymous-	NF	no factor TF: 75-76
2021-03-08	-anonymous-	NF	no factor TF: 74-75
2020-01-31	-anonymous-	NF	no factor TF: 73-74
2019-10-11	-anonymous-	NF	no factor TF: 72-73
2017-06-24	endless_mike	C-LL	27B0488168AD787A
2017-06-21	Dubslow	C-LL	27B0488168AD787A
2015-01-16	Gordon Spence	NF	no factor TF: 71-72
2014-12-17	NickOfTime	NF	no factor TF: 70-71
2014-12-17	NickOfTime	NF	no factor TF: 69-70
2009-11-07	Wolfgang Steger	C-LL	D2C321A16039CE82
2009-05-07	www.vwbroaching.com	NF-PM1	B1=450000, B2=9337500
2006-12-18	-anonymous-	NF	no factor TF: 1-69
2006-07-10	-anonymous-	NF	no factor TF: 1-62
2002-08-31	-anonymous-	NF	no factor TF: 1-57