12 406 841 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 =	2000000
B2 =	6127810920

ECM

Digits	B1	Curves
25	50000	2 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2001-07-17	William Johnston	9A9E4EA84923383F	7193452
Verified	2004-07-02	Piotr Sojka	9A9E4EA84923383F	8979713

History

Date	User	Type	Result
2024-10-17	Sid & Andy	NF	no factor from 2^72 to 2^73
2024-08-08	Tha	NF-PM1	B1=2000000, B2=6127810920
2021-12-19	Luminescence	NF-PM1	B1=600000, B2=640040940
2021-10-24	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-08-15	SRBase	NF	no factor from 2^70 to 2^71
2021-08-07	SRBase	NF	no factor from 2^69 to 2^70
2017-10-16	ramgeis	NF	no factor from 2^68 to 2^69
2015-08-08	Tha	NF	no factor from 2^67 to 2^68
2015-07-25	Tha	NF-PM1	B1=300000, B2=6000000, E=12
2015-03-15	Tha	NF	no factor from 2^66 to 2^67
2014-03-03	Nesowa	NF	no factor from 2^65 to 2^66
2013-07-19	lycorn	NF	no factor from 2^64 to 2^65