2 689 651 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶³

TF below 2^80 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	20000000
B2 =	54443613840

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	89 / 640

Estimated T-Level: 25.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Chris Duncombe Rae	CC95E96D73E3B4D5	0
Verified	1999-05-02	Hans Kesting	CC95E96D73E3B4D5	1477125
Verified	2018-07-28	kkmrkkblmbrbk	CC95E96D73E3B4D5	1373682

History

Date	User	Type	Result
2023-11-17	TJAOI	NF	no factor from 2^69 to 2^70
2023-04-19	kurly	NF-PM1	B1=20000000, B2=54443613840
2022-12-17	Joss	NF-PM1	B1=1000000, B2=595621950
2021-07-08	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-19	masser	NF-PM1	B1=2000000, B2=50000000, E=12
2019-04-08	TJAOI	NF	no factor from 2^67 to 2^68
2018-07-28	kkmrkkblmbrbk	C-LL	CC95E96D73E3B4D5
2018-07-11	Joss	NF-PM1	B1=670000, B2=6700000, E=6
2017-09-13	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-22	Joss	NF-PM1	B1=335000, B2=3350000, E=6
2016-12-20	Joss	NF-PM1	B1=201000
2016-07-09	Joss	NF-PM1	B1=167500, B2=4567500, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-01-27	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
2012-05-10	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-02-01	markr	NF-PM1	B1=105000, B2=2283750, E=6
2010-12-26	Joss	NF-PM1	B1=30000
2010-12-22	Joss	NF-PM1	B1=20000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61

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