4 158 163 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 2⁷²

TF target 2⁶⁵

P-1

B1 =	6200000
B2 =	33075839160

ECM

Digits	B1	Curves
25	50000	179 / 280

Estimated T-Level: 23.2 ⓘ

Status	Date	User	Residue	Shift
Verified		John Lloyd	6311333E99431AF1	0
Verified	2000-05-10	James G Henderson	6311333E99431AF1	334687

History

Date	User	Type	Result
2024-12-30	Andrew B	NF	no factor from 2^71 to 2^72
2022-11-16	DRobinsonPE	NF-PM1	B1=6200000, B2=33075839160
2022-10-11	Kevin_9611	NF-PM1	B1=220000, B2=104319930
2022-05-09	mikr	NF	no factor from 2^70 to 2^71
2021-06-26	axn	NF	no factor from 2^69 to 2^70
2021-06-26	axn	NF	no factor from 2^68 to 2^69
2020-11-27	Carlos Pinho	NF-PM1	B1=153000, B2=4009000, E=6
2018-11-29	Yxinity	NF	no factor from 2^67 to 2^68
2017-12-18	Yxinity	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-06-04	snme2pm1	NF	no factor from 2^65 to 2^66
2013-11-01	David Campeau	NF	no factor from 2^64 to 2^65
2013-10-02	Jayder	NF	no factor from 2^63 to 2^64
2013-07-20	Squeeky_Squirrel	NF-PM1	B1=125000, B2=2375000, E=6
2011-08-12	USAFSS	NF-PM1	B1=45000, B2=630000, E=6
2011-07-17	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-01-17	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-07-31	Carsten Kossendey	NF-PM1	B1=25000, B2=325000