15 862 981 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 2⁶⁹

P-1

B1 =	4592000
B2 =	16993946970

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2002-10-19	Bernie Fleitman	AEC063DFBD5C644D	5447453
Verified	2006-03-14	Robert Tjia	AEC063DFBD5C644D	10045923

History

Date	User	Type	Result
2024-09-23	Jason Lynch	NF-PM1	B1=4592000, B2=16993946970
2021-11-28	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-09-12	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-07	SRBase	NF	no factor from 2^70 to 2^71
2021-05-27	lycorn	NF	no factor from 2^69 to 2^70
2020-11-03	Tha	NF-PM1	B1=1500000, B2=30000000, E=12
2018-03-23	ramgeis	NF	no factor from 2^68 to 2^69
2018-03-23	ramgeis	NF	no factor from 2^67 to 2^68
2016-03-16	Mark Rose	NF	no factor from 2^65 to 2^66
2014-07-20	Nesowa	NF	no factor from 2^66 to 2^67