2 826 413 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
63908637329867391933943	23	75.8	2021-05-02 11:00:47

ECM

Digits	B1	Curves
25	50000	83 / 280

Estimated T-Level: 21.5 ⓘ

TF below 2^66 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Thomas Krawczyk	7F4E33EBCC0883AD	0
Verified (Factored)	1999-04-23	James Arnold	7F4E33EBCC0883AD	1823581
Verified (Factored)	2018-09-08	kkmrkkblmbrbk	7F4E33EBCC0883AD	189880

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-05-03	XZT	95FA55684979E258	1	476488	5	3

History

Date	User	Type	Result
2021-05-03	curtisc	CERT	PRP Certification Proof certified good
2021-05-03	XZT	C-PRP	M2826413/63908637329867391933943 : 95FA55684979E258 PRP proof power = 7 PRP: Verified Proof certified good
2021-05-02	daveward2005	F-ECM	Factor: 63908637329867391933943 / (ECM curve 4, B1=50000, B2=5000000)
2020-01-24	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-11-10	masser	NF-PM1	B1=3000000, B2=30000000, E=12
2019-01-03	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-08	kkmrkkblmbrbk	C-LL	7F4E33EBCC0883AD
2017-10-28	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-03-13	Joss	NF-PM1	B1=361303, B2=3613030, E=6
2016-12-14	Joss	NF-PM1	B1=301086
2016-11-03	Joss	NF-PM1	B1=250905
2016-10-27	Joss	NF-PM1	B1=174240
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-13	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-02-16	markr	NF	no factor from 2^61 to 2^62
2009-02-12	Sturle Sunde	NF	no factor from 2^60 to 2^61