8 891 291 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

TF

No factors below 2⁷²

TF target 2⁶⁸

P-1

B1 =	3000000
B2 =	4198632900

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

Status	Date	User	Residue	Shift
Verified	2000-02-09	Nicolas Graner	6CD81F2F177C9842	3737524
Verified	2003-04-03	HMC Math 300MHz Beowulf	6CD81F2F177C9842	3150269

History

Date	User	Type	Result
2022-07-16	linament	NF-PM1	B1=3000000, B2=4198632900
2022-07-15	linament	NF-PM1	B1=2999900
2022-06-18	linament	NF	no factor from 2^71 to 2^72
2021-11-25	mikr	NF	no factor from 2^70 to 2^71
2020-10-02	-Anonymous-	NF	no factor from 2^69 to 2^70
2020-05-08	TJAOI	NF	no factor from 2^68 to 2^69
2018-04-17	monst	NF	no factor from 2^67 to 2^68
2016-03-09	snme2pm1	NF	no factor from 2^66 to 2^67
2015-05-25	VictordeHollander	NF	no factor from 2^65 to 2^66
2014-01-11	lycorn	NF	no factor from 2^64 to 2^65
2012-08-21	Markus Tervooren	NF-PM1	B1=200000, B2=2500000, E=6