2 560 697 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
4028616372624567386527	22	71.8	2020-07-31 20:45:38

ECM

Digits	B1	Curves
25	50000	53 / 280

Estimated T-Level: 20.9 ⓘ

TF below 2^65 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		William Ono	6BEEA137C81B026D	0
Verified (Factored)	1999-11-04	David Linton	6BEEA137C81B026D	1710764
Verified (Factored)	2018-06-13	kkmrkkblmbrbk	6BEEA137C81B026D	985289

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-08-02	ANONYMOUS	CCD9408D77F77A4A	1	483632	5	3
Verified	2020-08-05	fre_games	CCD9408D77F77A4A	1	1204165	5	3

History

Date	User	Type	Result
2020-08-05	fre_games	C-PRP	M2560697/4028616372624567386527 : CCD9408D77F77A4A PRP: Verified PRP without proof (not generated)
2020-08-02	ANONYMOUS	C-PRP	M2560697/4028616372624567386527 : CCD9408D77F77A4A PRP: Verified PRP without proof (not generated)
2020-07-31	GAN	F-ECM	Factor: 4028616372624567386527 / (ECM curve 2, B1=50000, B2=5000000, Sigma=8842502003232934)
2019-07-01	TJAOI	NF	no factor from 2^67 to 2^68
2018-06-13	kkmrkkblmbrbk	C-LL	6BEEA137C81B026D
2017-08-11	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-04-26	mikr	NF-PM1	B1=3200000, B2=112000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-11-08	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-23	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-23	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-16	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-04-12	James Heinrich	NF-PM1	B1=175000, B2=4068750, E=6
2011-01-10	Joss	NF-PM1	B1=50000
2011-01-03	Joss	NF-PM1	B1=30000
2010-12-21	Joss	NF-PM1	B1=20000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61