2 925 817 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
4278040635978638573126473	25	81.8	2021-07-16 09:25:26

ECM

Digits	B1	Curves
25	50000	85 / 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)		Greg Hawley	D2E75CCA32F0934C	0
Verified (Factored)	1999-06-06	Massimo Cappelli	D2E75CCA32F0934C	554381
Verified (Factored)	2018-10-06	kkmrkkblmbrbk	D2E75CCA32F0934C	640724

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-07-16	SRJ2877	64643352946D0A09	1	1663843	5	3

History

Date	User	Type	Result
2021-07-16	dale	CERT	PRP Certification Proof certified good
2021-07-16	SRJ2877	C-PRP	M2925817/4278040635978638573126473 : 64643352946D0A09 PRP proof power = 7 PRP: Verified Proof certified good
2021-07-16	daveward2005	F-ECM	Factor: 4278040635978638573126473 / (ECM curve 4, B1=50000, B2=5000000, Sigma=1259937918653596)
2021-05-31	TJAOI	NF	no factor from 2^68 to 2^69
2018-12-20	chuenkit	NF	no factor from 2^67 to 2^68
2018-10-06	kkmrkkblmbrbk	C-LL	D2E75CCA32F0934C
2017-11-22	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-23	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-27	VictordeHollander	NF-PM1	B1=1000000, B2=20000000, E=12
2015-04-25	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-25	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-08	markr	NF	no factor from 2^61 to 2^62
2010-11-12	markr	NF-PM1	B1=105000, B2=2283750, E=6
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61