15 931 589 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 2⁶⁹

P-1

B1 =	1500000
B2 =	1100130570

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2003-01-25	Steve Spicer	11538C5F6B7273C0	14415252
Verified	2006-04-28	Colin Archibald	11538C5F6B7273C0	3950460

History

Date	User	Type	Result
2024-10-07	Sid & Andy	NF-PM1	B1=1500000, B2=1100130570
2022-02-18	-Anonymous-	NF	no factor from 2^73 to 2^74
2022-02-18	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-09-20	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-04	lycorn	NF	no factor from 2^70 to 2^71
2021-05-13	lycorn	NF	no factor from 2^69 to 2^70
2018-03-06	ramgeis	NF	no factor from 2^68 to 2^69
2018-03-06	ramgeis	NF	no factor from 2^67 to 2^68
2016-03-16	Mark Rose	NF	no factor from 2^65 to 2^66
2014-07-29	Nesowa	NF	no factor from 2^66 to 2^67