2 667 631 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 2^81 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	104 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Matthias Menzel	DC3E1ED1BB8DF0B2	0
Verified	1999-04-23	Borja Sotomayor	DC3E1ED1BB8DF0B2	1882305
Verified	2018-07-23	kkmrkkblmbrbk	DC3E1ED1BB8DF0B2	1025675

History

Date	User	Type	Result
2024-02-02	TJAOI	NF	no factor from 2^69 to 2^70
2022-12-14	kurly	NF-PM1	B1=20000000, B2=54443613840
2021-06-14	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-24	masser	NF-PM1	B1=2000000, B2=50000000, E=12
2019-04-29	TJAOI	NF	no factor from 2^67 to 2^68
2018-09-04	Joss	NF-PM1	B1=630230, B2=2520920
2018-09-03	Joss	NF-PM1	B1=630230, B2=1890690
2018-08-30	Joss	NF-PM1	B1=630230, B2=1260460
2018-08-29	Joss	NF-PM1	B1=630230
2018-07-23	kkmrkkblmbrbk	C-LL	DC3E1ED1BB8DF0B2
2017-09-08	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-03-07	Joss	NF-PM1	B1=315115, B2=3151150, E=6
2017-01-10	Joss	NF-PM1	B1=218830
2016-12-18	Joss	NF-PM1	B1=182359
2016-06-09	Joss	NF-PM1	B1=151966, B2=4567500, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-01-25	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
2014-11-06	Joss	NF-PM1	B1=129060
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-18	markr	NF	no factor from 2^61 to 2^62
2010-12-10	markr	NF-PM1	B1=105000, B2=2283750, E=6
2010-11-19	Joss	NF-PM1	B1=20000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61

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