2 665 939 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 2^74 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	20000000
B2 =	54443613840

ECM

Digits	B1	Curves
25	50000	214 / 280

Estimated T-Level: 23.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Tony Forbes	4CFCD4FB5F37DBB2	0
Verified		Klaus Kastens	4CFCD4FB5F37DBB2	0
Verified	2015-11-14	MadPoo	4CFCD4FB5F37DBB2	2353027

History

Date	User	Type	Result
2024-02-23	TJAOI	NF	no factor from 2^69 to 2^70
2022-12-09	kurly	NF-PM1	B1=20000000, B2=54443613840
2021-06-14	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-22	masser	NF-PM1	B1=2000000, B2=50000000, E=12
2019-04-29	TJAOI	NF	no factor from 2^67 to 2^68
2018-09-07	Joss	NF-PM1	B1=630296, B2=2521184
2018-09-04	Joss	NF-PM1	B1=630296, B2=1890888
2018-09-03	Joss	NF-PM1	B1=630296, B2=1260592
2018-08-30	Joss	NF-PM1	B1=630296
2018-08-29	Joss	NF-PM1	B1=626612
2017-09-08	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-03-07	Joss	NF-PM1	B1=315148, B2=3151480, E=6
2017-01-10	Joss	NF-PM1	B1=218854
2016-12-18	Joss	NF-PM1	B1=182379
2016-06-08	Joss	NF-PM1	B1=151983, 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
2015-11-14	MadPoo	C-LL	4CFCD4FB5F37DBB2
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=129076
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-20	markr	NF	no factor from 2^61 to 2^62
2011-02-03	markr	NF-PM1	B1=105000, B2=2283750, E=6
2010-12-26	Joss	NF-PM1	B1=30000
2010-12-21	Joss	NF-PM1	B1=20000
2009-01-30	Sturle Sunde	NF	no factor from 2^60 to 2^61

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