12 504 917 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 =	3000000
B2 =	11589198390

ECM

Digits	B1	Curves
25	50000	2 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2002-09-22	Ars Technica Team Prime Rib	872ACCF4FC149C90	4800046
Verified	2004-07-13	Marc Getty / Phil Fizur	872ACCF4FC149C90	8194114

History

Date	User	Type	Result
2024-09-08	Sid & Andy	NF	no factor from 2^72 to 2^73
2023-02-07	Naegi Makoto	NF-PM1	B1=3000000, B2=11589198390
2021-12-17	Luminescence	NF-PM1	B1=300000, B2=161861700
2021-10-25	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-08-18	SRBase	NF	no factor from 2^70 to 2^71
2021-08-07	SRBase	NF	no factor from 2^69 to 2^70
2017-10-25	ramgeis	NF	no factor from 2^68 to 2^69
2017-01-10	Smok_bmv	NF	no factor from 2^67 to 2^68
2015-03-21	Tha	NF	no factor from 2^66 to 2^67
2014-03-28	Nesowa	NF	no factor from 2^65 to 2^66
2013-06-20	lycorn	NF	no factor from 2^64 to 2^65
2011-01-17	Roman Maznichenko	NF-PM1	B1=200000, B2=4000000, E=6