81 844 673 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 2⁷⁵

TF target 2⁷⁵

P-1

B1 =	695000
B2 =	14247500

Status	Date	User	Residue	Shift	Software
Verified	2018-12-15	Athi	42970C74AF3E909E	73406801	Windows 64-bit,Prime95,v29.4,build 8
Verified	2025-03-04	ixfd64	42970C74AF3E909E	46350282	Windows 64-bit,Prime95,v30.19,build 20

History

Date	User	Type	Result
2025-03-04	ixfd64	C-LL	42970C74AF3E909E
2018-12-15	Athi	C-LL	42970C74AF3E909E
2016-11-27	TheJudger	NF-PM1	B1=695000, B2=14247500, E=12
2016-11-14	AK76	NF	no factor TF: 74-75
2016-11-14	AK76	NF	no factor TF: 73-74
2016-08-18	Bdot	NF	no factor TF: 72-73
2016-08-18	Bdot	NF	no factor TF: 71-72
2013-06-14	sbalamut	NF	no factor TF: 70-71
2013-02-01	rjbelans	NF	no factor TF: 69-70
2013-01-29	rjbelans	NF	no factor TF: 68-69
2011-03-31	linded	NF	no factor TF: 67-68
2011-02-28	-anonymous-	NF	no factor TF: 66-67
2011-02-28	firejuggler	NF	no factor TF: 65-66
2010-12-15	Architects Cubed	NF	no factor TF: 64-65