15 418 493 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 =	1500000
B2 =	756000960

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Bad	2002-04-28	zufandel	02FC654072FD24BE	979332
Bad	2003-12-23	Russell Rogers	5618F77BC240FA3D	13815815
Verified	2004-10-18	Ars Technica Team Prime Rib	FD8DAD8024C0F3F3	4016844
Verified	2006-02-01	peter	FD8DAD8024C0F3F3	3232206

History

Date	User	Type	Result
2024-07-04	Sid & Andy	NF-PM1	B1=1500000, B2=756000960
2023-06-22	RichD0	NF	no factor from 2^72 to 2^73
2021-09-17	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-07	SRBase	NF	no factor from 2^70 to 2^71
2021-06-10	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
2014-02-23	Nesowa	NF	no factor from 2^66 to 2^67