81 508 633 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 2⁷⁵

P-1

B1 =	650000
B2 =	12675000

Status	Date	User	Residue	Shift	Software
Verified	2017-08-21	curtisc	495874F425A518A3	14138829	Windows Service,Prime95,v28.7,build 1
Verified	2025-08-26	automan1100	495874F425A518A3	24710516	Windows 64-bit,Prime95,v30.19,build 20

History

Date	User	Type	Result
2025-08-26	automan1100	C-LL	495874F425A518A3
2017-08-21	curtisc	C-LL	495874F425A518A3
2016-11-13	TheJudger	NF-PM1	B1=650000, B2=12675000, E=12
2016-11-09	dh1	NF	no factor TF: 75-76
2016-11-08	electron1897	NF	no factor TF: 74-75
2016-11-05	RichD0	NF	no factor TF: 73-74
2016-10-01	Judge Hale	NF	no factor TF: 72-73
2016-10-01	Judge Hale	NF	no factor TF: 71-72
2011-03-04	Ungelovende	NF	no factor TF: 70-71
2011-03-04	Ungelovende	NF	no factor TF: 69-70
2011-03-04	Ungelovende	NF	no factor TF: 68-69
2011-03-04	Ungelovende	NF	no factor TF: 67-68
2011-03-04	Ungelovende	NF	no factor TF: 65-67
2010-12-13	Architects Cubed	NF	no factor TF: 64-65