12 564 193 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 =	12199971630

ECM

Digits	B1	Curves
25	50000	2 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2002-04-28	Mike Conradi	7213AA0FA5540815	7612259
Verified	2005-01-20	Lawrence Cairns-Smith	7213AA0FA5540815	4328187

History

Date	User	Type	Result
2024-08-09	linament	NF	no factor from 2^72 to 2^73
2023-03-26	Naegi Makoto	NF-PM1	B1=3000000, B2=12199971630
2021-10-29	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-08-30	SRBase	NF	no factor from 2^70 to 2^71
2021-08-07	SRBase	NF	no factor from 2^69 to 2^70
2017-12-16	ramgeis	NF	no factor from 2^68 to 2^69
2017-12-16	ramgeis	NF	no factor from 2^67 to 2^68
2015-03-24	Tha	NF	no factor from 2^66 to 2^67
2014-03-28	Nesowa	NF	no factor from 2^65 to 2^66
2013-06-18	lycorn	NF	no factor from 2^64 to 2^65