2 873 491 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
13589016588328171596889	23	73.5	2020-08-12 16:41:14

ECM

Digits	B1	Curves
25	50000	23 / 280

Estimated T-Level: 20.4 ⓘ

TF below 2^63 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1997-12-30	John R Pierce	1A28F6D55B5D5A9F	0
Verified (Factored)	1999-09-22	George B. Patelis	1A28F6D55B5D5A9F	831364
Verified (Factored)	2018-09-22	kkmrkkblmbrbk	1A28F6D55B5D5A9F	1723092

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-08-17	atrench	8E6810E04EBA39C6	1	918305	5	3
Verified	2020-08-23	oodaira	8E6810E04EBA39C6	1	86447	5	3

History

Date	User	Type	Result
2020-08-23	oodaira	C-PRP	M2873491/13589016588328171596889 : 8E6810E04EBA39C6 PRP: Verified PRP without proof (not generated)
2020-08-17	atrench	C-PRP	M2873491/13589016588328171596889 : 8E6810E04EBA39C6 PRP: Verified PRP without proof (not generated)
2020-08-12	GAN	F-ECM	Factor: 13589016588328171596889 / (ECM curve 2, B1=50000, B2=5000000, Sigma=3152351964379192)
2020-03-01	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-10-21	masser	NF-PM1	B1=2880000, B2=28800000, E=12
2019-01-09	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-22	kkmrkkblmbrbk	C-LL	1A28F6D55B5D5A9F
2017-11-12	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-08-19	Joss	NF-PM1	B1=400000, B2=4000000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2016-02-18	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
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-28	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-02-06	markr	NF-PM1	B1=200000, B2=5250000, E=6
2011-01-22	Joss	NF-PM1	B1=50000
2011-01-03	Joss	NF-PM1	B1=30000
2010-12-23	Joss	NF-PM1	B1=20000
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=161250
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61

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