12 738 919 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 =	600000
B2 =	1202701500

ECM

Digits	B1	Curves
25	50000	2 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Daniel Swanson	02EE1763B41C11BB	0
Verified	2002-03-16	Stephen Wood	02EE1763B41C11BB	1141477
Bad	2005-11-01	Ars Technica Team Prime Rib	5705DDD6568B2C87	6362990

History

Date	User	Type	Result
2024-06-23	linament	NF	no factor from 2^72 to 2^73
2021-12-29	Luminescence	NF-PM1	B1=600000, B2=1202701500
2021-10-30	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-08-29	SRBase	NF	no factor from 2^70 to 2^71
2021-08-07	SRBase	NF	no factor from 2^69 to 2^70
2018-01-07	ramgeis	NF	no factor from 2^68 to 2^69
2018-01-07	ramgeis	NF	no factor from 2^67 to 2^68
2015-07-06	Tha	NF-PM1	B1=300000, B2=6000000, E=12
2015-04-04	Tha	NF	no factor from 2^66 to 2^67
2014-04-21	Nesowa	NF	no factor from 2^65 to 2^66
2013-06-07	lycorn	NF	no factor from 2^64 to 2^65