8 104 639 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 2⁶⁷

P-1

B1 =	1500000
B2 =	802676160

ECM

Digits	B1	Curves
25	50000	6 / 280

Estimated T-Level: 20.1 ⓘ

Status	Date	User	Residue	Shift
Verified	2000-02-01	David Brooks	40B377B314E40941	2442675
Verified	2002-09-14	rodger	40B377B314E40941	292650

History

Date	User	Type	Result
2022-05-13	Flaukrotist	NF	no factor from 2^72 to 2^73
2022-02-23	Flaukrotist	NF-PM1	B1=1500000, B2=802676160
2021-10-05	SRBase	NF	no factor from 2^71 to 2^72
2021-08-26	SRBase	NF	no factor from 2^70 to 2^71
2021-08-19	SRBase	NF	no factor from 2^69 to 2^70
2019-11-24	mnd9	NF	no factor from 2^68 to 2^69
2018-07-03	chuenkit	NF	no factor from 2^67 to 2^68
2015-11-26	snme2pm1	NF	no factor from 2^66 to 2^67
2015-04-20	snme2pm1	NF	no factor from 2^65 to 2^66
2013-12-26	David Campeau	NF	no factor from 2^64 to 2^65
2012-09-22	James Heinrich	NF-PM1	B1=205000, B2=4561250, E=6
2012-07-19	Axelsson	NF	no factor from 2^63 to 2^64