4 907 857 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 =	4000000
B2 =	10397372700

ECM

Digits	B1	Curves
25	50000	104 / 280

Estimated T-Level: 21.9 ⓘ

Status	Date	User	Residue	Shift
Verified	1998-06-07	Denis G. CLAVE	9A4CFDF8A4B7DBF2	0
Verified	2000-04-27	Sergio Zlotnik	9A4CFDF8A4B7DBF2	1840

History

Date	User	Type	Result
2023-04-10	Sid & Andy	NF-PM1	B1=4000000, B2=10397372700
2021-04-26	-Anonymous-	NF	no factor from 2^71 to 2^72
2021-04-24	-Anonymous-	NF	no factor from 2^70 to 2^71
2021-04-23	-Anonymous-	NF	no factor from 2^69 to 2^70
2021-03-22	TJAOI	NF	no factor from 2^68 to 2^69
2018-05-23	ramgeis	NF	no factor from 2^67 to 2^68
2017-10-29	Yxinity	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-07-24	snme2pm1	NF	no factor from 2^65 to 2^66
2014-12-29	VictordeHollander	NF	no factor from 2^64 to 2^65
2014-12-29	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-18	mikr	NF-PM1	B1=1200000, B2=39750000, E=12
2011-09-03	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-07-11	Squeeky_Squirrel	NF-PM1	B1=60000, B2=960000, E=6
2010-04-10	markr	NF	no factor from 2^61 to 2^62
2009-08-30	Carsten Kossendey	NF-PM1	B1=30000, B2=435000