15 643 447 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 =	674465610

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2002-08-17	Martin Winder	E9003D73092DE415	1731673
Verified	2006-10-24	Alexander Grässer	E9003D73092DE415	5433931

History

Date	User	Type	Result
2024-08-09	Sid & Andy	NF-PM1	B1=1500000, B2=674465610
2022-04-03	TheJudger	NF	no factor from 2^73 to 2^74
2022-04-03	TheJudger	NF	no factor from 2^72 to 2^73
2021-10-09	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-16	SRBase	NF	no factor from 2^70 to 2^71
2021-06-14	lycorn	NF	no factor from 2^69 to 2^70
2018-03-01	ramgeis	NF	no factor from 2^68 to 2^69
2018-03-01	ramgeis	NF	no factor from 2^67 to 2^68
2016-03-16	Mark Rose	NF	no factor from 2^65 to 2^66
2013-12-31	Nesowa	NF	no factor from 2^66 to 2^67