4 981 513 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 =	7000000
B2 =	8975658510

ECM

Digits	B1	Curves
25	50000	137 / 280

Estimated T-Level: 22.4 ⓘ

Status	Date	User	Residue	Shift
Bad	1998-11-14	Lars Gustafsson	ECCE0FABE9F13CDB	0
Verified	2000-05-24	michael boeker	E0393209E68FD7AB	2921559
Verified	2001-05-13	Stephen Wood	E0393209E68FD7AB	1481349

History

Date	User	Type	Result
2022-09-15	Prism Daymon	NF-PM1	B1=7000000, B2=8975658510
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
2021-02-15	TJAOI	NF	no factor from 2^68 to 2^69
2018-06-05	ramgeis	NF	no factor from 2^67 to 2^68
2017-05-22	Yxinity	NF	no factor from 2^66 to 2^67
2016-12-12	Ismo Laitela	NF-PM1	B1=1888594, B2=58546412, E=12
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-07-31	snme2pm1	NF	no factor from 2^65 to 2^66
2014-12-26	VictordeHollander	NF	no factor from 2^64 to 2^65
2014-12-26	VictordeHollander	NF	no factor from 2^63 to 2^64
2011-08-27	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2009-12-05	markr	NF	no factor from 2^61 to 2^62
2009-11-28	markr	NF-PM1	B1=75000, B2=1500000, E=6