3 851 899 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 2⁷¹

TF target 2⁶⁴

TF below 2^77 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	8700000
B2 =	44721426750

ECM

Digits	B1	Curves
25	50000	256 / 280

Estimated T-Level: 24.6 ⓘ

Status	Date	User	Residue	Shift
Verified		Mike Weber	76DAB6122919077C	0
Verified	1999-09-07	Dan and Hannah Rubin	76DAB6122919077C	3708887

History

Date	User	Type	Result
2025-02-07	TJAOI	NF	no factor from 2^70 to 2^71
2022-05-08	DRobinsonPE	NF-PM1	B1=8700000, B2=44721426750
2022-04-21	DRobinsonPE	NF	no factor from 2^69 to 2^70
2022-01-30	Joss	NF-PM1	B1=1000000, B2=1035311550
2020-10-26	TJAOI	NF	no factor from 2^68 to 2^69
2019-02-08	Yxinity	NF	no factor from 2^67 to 2^68
2016-11-22	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-03-07	ramgeis	NF	no factor from 2^65 to 2^66
2016-03-02	Joss	NF-PM1	B1=250905, B2=4516290, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-01-11	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-01-11	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-19	Joss	NF-PM1	B1=86663
2012-02-20	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-10-23	Squeeky_Squirrel	NF-PM1	B1=70000, B2=1137500, E=6
2011-03-02	markr	NF	no factor from 2^61 to 2^62
2009-07-27	Carsten Kossendey	NF-PM1	B1=20000, B2=270000
2009-02-25	S485122	NF	no factor from 2^60 to 2^61