4 153 871 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

TF below 2^76 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	18927000
B2 =	386108172450

ECM

Digits	B1	Curves
25	50000	248 / 280

Estimated T-Level: 24.4 ⓘ

Status	Date	User	Residue	Shift
Verified		John Lloyd	3C5A22E0F71B72AD	0
Verified	1999-12-30	Ethan O'Connor	3C5A22E0F71B72AD	1634166

History

Date	User	Type	Result
2025-04-09	Jason Lynch	NF-PM1	B1=18927000, B2=386108172450
2025-01-06	Andrew B	NF	no factor from 2^71 to 2^72
2022-05-08	mikr	NF	no factor from 2^70 to 2^71
2021-07-29	axn	NF-PM1	B1=13000000, B2=650000000
2021-06-23	axn	NF	no factor from 2^69 to 2^70
2021-06-23	axn	NF	no factor from 2^68 to 2^69
2020-11-27	Carlos Pinho	NF-PM1	B1=153000, B2=4003000, E=6
2018-11-29	Yxinity	NF	no factor from 2^67 to 2^68
2017-12-17	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
2013-11-23	David Campeau	NF	no factor from 2^64 to 2^65
2013-09-28	Jayder	NF	no factor from 2^63 to 2^64
2013-07-16	Squeeky_Squirrel	NF-PM1	B1=125000, B2=2375000, E=6
2011-08-11	USAFSS	NF-PM1	B1=45000, B2=630000, E=6
2011-07-01	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-01-02	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-07-31	Carsten Kossendey	NF-PM1	B1=25000, B2=325000