8 908 223 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 2⁷³

TF target 2⁶⁸

P-1

B1 =	2500000
B2 =	1778667330

ECM

Digits	B1	Curves
25	50000	3 / 280

Estimated T-Level: 20.1 ⓘ

Status	Date	User	Residue	Shift
Verified	2000-01-12	Bill Denney	1A29EEB1C3597EEF	1166665
Verified	2003-02-24	Ars Technica Team Prime Rib	1A29EEB1C3597EEF	1631339

History

Date	User	Type	Result
2022-07-30	Cong Shengzhuo	NF-PM1	B1=2500000, B2=1778667330
2021-12-10	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-11	SRBase	NF	no factor from 2^71 to 2^72
2021-08-29	SRBase	NF	no factor from 2^70 to 2^71
2021-08-20	SRBase	NF	no factor from 2^69 to 2^70
2019-11-19	mnd9	NF	no factor from 2^68 to 2^69
2018-04-07	monst	NF	no factor from 2^67 to 2^68
2016-03-10	snme2pm1	NF	no factor from 2^66 to 2^67
2015-05-17	VictordeHollander	NF	no factor from 2^65 to 2^66
2014-01-11	lycorn	NF	no factor from 2^64 to 2^65
2012-07-10	James Heinrich	NF-PM1	B1=165000, B2=3588750, E=6