18 999 397 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 =	2879000
B2 =	13650582330

ECM

Digits	B1	Curves
25	50000	1 / 280

Estimated T-Level: 20.0 ⓘ

Status	Date	User	Residue	Shift
Verified	2003-05-04	Giuseppe Miano	593705372BCED419	4973095
Verified	2007-08-14	David J. Stucki	593705372BCED419	10148054

History

Date	User	Type	Result
2024-09-06	Jason Lynch	NF-PM1	B1=2879000, B2=13650582330
2022-01-04	-Anonymous-	NF	no factor from 2^73 to 2^74
2021-11-19	-Anonymous-	NF	no factor from 2^72 to 2^73
2021-10-08	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-09-12	SRBase	NF	no factor from 2^70 to 2^71
2020-04-09	timbit	NF-PM1	B1=430000, B2=17415000, E=12
2020-01-15	lycorn	NF	no factor from 2^69 to 2^70
2017-09-01	ramgeis	NF	no factor from 2^68 to 2^69
2017-09-01	ramgeis	NF	no factor from 2^67 to 2^68
2014-07-29	Nesowa	NF	no factor from 2^66 to 2^67