13 138 919 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 2⁷⁴

TF target 2⁶⁸

P-1

B1 =	1600000
B2 =	1620719100

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2001-10-20	Sheldon Young	6B2D7B1D89DEC2A4	10366695
Verified	2004-11-03	Ars Technica Team Prime Rib	6B2D7B1D89DEC2A4	6713350

History

Date	User	Type	Result
2023-10-11	nordi	NF-PM1	B1=1600000, B2=1620719100
2023-10-06	nordi	NF-PM1	B1=1600000
2022-03-04	-Anonymous-	NF	no factor from 2^73 to 2^74
2022-03-04	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-22	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-06	SRBase	NF	no factor from 2^70 to 2^71
2021-08-07	SRBase	NF	no factor from 2^69 to 2^70
2021-02-13	ixfd64	NF-PM1	B1=250000, B2=4500000, E=6
2018-01-07	ramgeis	NF	no factor from 2^68 to 2^69
2017-12-23	-Anonymous-	NF	no factor from 2^67 to 2^68
2015-07-12	Nesowa	NF	no factor from 2^66 to 2^67
2014-05-26	Nesowa	NF	no factor from 2^65 to 2^66
2013-05-22	lycorn	NF	no factor from 2^64 to 2^65