2 862 941 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 =	10000000
B2 =	19219868850

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	81 / 640

Estimated T-Level: 25.6 ⓘ

Status	Date	User	Residue	Shift
Verified		Markus Werner	DB3504DD704E30FC	0
Verified		Pete Evans	DB3504DD704E30FC	0
Verified	1999-05-23	Stephen Hinton	DB3504DD704E30FC	1263305

History

Date	User	Type	Result
2023-06-22	TJAOI	NF	no factor from 2^69 to 2^70
2022-07-25	mikr	NF-PM1	B1=10000000, B2=19219868850
2021-06-14	TJAOI	NF	no factor from 2^68 to 2^69
2019-10-24	masser	NF-PM1	B1=2870000, B2=28700000, E=12
2019-01-08	chuenkit	NF	no factor from 2^67 to 2^68
2018-08-30	Joss	NF-PM1	B1=858008, B2=2574024, E=6
2018-08-27	Joss	NF-PM1	B1=858008, B2=1716016, E=6
2017-11-12	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-04	Joss	NF-PM1	B1=324721, B2=3247210, E=6
2017-01-10	Joss	NF-PM1	B1=225501
2016-12-19	Joss	NF-PM1	B1=187918
2016-08-25	Joss	NF-PM1	B1=156599, B2=4830000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 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
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-02-03	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-02-09	markr	NF-PM1	B1=115000, B2=2415000, E=6
2011-01-21	Joss	NF-PM1	B1=50000
2011-01-03	Joss	NF-PM1	B1=30000
2010-12-22	Joss	NF-PM1	B1=20000
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=157500
2009-02-12	Sturle Sunde	NF	no factor from 2^60 to 2^61

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