2 638 879 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 2^75 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	20000000
B2 =	54443613840

ECM

Digits	B1	Curves
25	50000	224 / 280

Estimated T-Level: 24.0 ⓘ

Status	Date	User	Residue	Shift
Verified		Jeffrey L. Vagle	C7F1A143EF857CC0	0
Verified	1999-04-02	Bjørn Roger Larsen	C7F1A143EF857CC0	922432
Verified	2018-07-12	kkmrkkblmbrbk	C7F1A143EF857CC0	936706

History

Date	User	Type	Result
2024-01-19	TJAOI	NF	no factor from 2^69 to 2^70
2023-02-21	kurly	NF-PM1	B1=20000000, B2=54443613840
2022-12-05	Joss	NF-PM1	B1=1000000, B2=449428980
2021-05-19	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-04	masser	NF-PM1	B1=2640000, B2=26400000, E=12
2019-03-11	TJAOI	NF	no factor from 2^67 to 2^68
2018-07-12	kkmrkkblmbrbk	C-LL	C7F1A143EF857CC0
2017-09-08	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-05-08	Joss	NF-PM1	B1=360000, B2=3600000, E=6
2016-12-27	Joss	NF-PM1	B1=206385
2016-12-26	Joss	NF-PM1	B1=171988
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2016-01-21	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
2012-06-14	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-01-17	James Heinrich	NF-PM1	B1=180000, B2=4275000, E=6
2009-06-21	USAFSS	NF-PM1	B1=30000, B2=420000
2009-01-27	Sturle Sunde	NF	no factor from 2^60 to 2^61

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