13 308 931 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 =	1657907160

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2001-10-25	Steve Spicer	033B27D9C1F9198E	6940864
Verified	2005-02-23	Ars Technica Team Prime Rib	033B27D9C1F9198E	5466787

History

Date	User	Type	Result
2023-05-02	nordi	NF-PM1	B1=1600000, B2=1657907160
2023-02-05	nordi	NF-PM1	B1=1600000
2022-02-21	-Anonymous-	NF	no factor from 2^73 to 2^74
2022-02-20	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-22	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-03	SRBase	NF	no factor from 2^70 to 2^71
2021-08-08	SRBase	NF	no factor from 2^69 to 2^70
2018-01-14	ramgeis	NF	no factor from 2^68 to 2^69
2017-12-23	-Anonymous-	NF	no factor from 2^67 to 2^68
2015-07-22	Nesowa	NF	no factor from 2^66 to 2^67
2014-06-07	Nesowa	NF	no factor from 2^65 to 2^66
2013-05-15	lycorn	NF	no factor from 2^64 to 2^65