2 693 591 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 2^76 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	20000000
B2 =	54443613840

ECM

Digits	B1	Curves
25	50000	238 / 280

Estimated T-Level: 24.3 ⓘ

Status	Date	User	Residue	Shift
Verified	1997-11-11	Herb Savage	0E69019FB4B4F652	0
Verified	1999-04-23	Aaron B	0E69019FB4B4F652	2487396
Verified	2018-07-29	kkmrkkblmbrbk	0E69019FB4B4F652	591304

History

Date	User	Type	Result
2023-12-19	TJAOI	NF	no factor from 2^69 to 2^70
2023-04-29	kurly	NF-PM1	B1=20000000, B2=54443613840
2022-12-18	Joss	NF-PM1	B1=1000000, B2=595621950
2021-07-01	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-30	masser	NF-PM1	B1=2000000, B2=50000000, E=12
2019-03-25	TJAOI	NF	no factor from 2^67 to 2^68
2018-07-29	kkmrkkblmbrbk	C-LL	0E69019FB4B4F652
2018-07-16	Joss	NF-PM1	B1=670000, B2=6700000, E=6
2017-09-15	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
2016-07-16	Joss	NF-PM1	B1=167500, B2=4620000, 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
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-03	markr	NF	no factor from 2^61 to 2^62
2011-01-31	markr	NF-PM1	B1=105000, B2=2310000, 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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