2 672 821 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	216 / 280

Estimated T-Level: 23.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Mike Hartle	7FD16187F8E065B3	0
Verified	1999-07-26	Bruce Hebden	7FD16187F8E065B3	700837
Verified	2018-07-24	kkmrkkblmbrbk	7FD16187F8E065B3	82593

History

Date	User	Type	Result
2024-01-03	TJAOI	NF	no factor from 2^69 to 2^70
2022-11-25	kurly	NF-PM1	B1=20000000, B2=54443613840
2021-06-03	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-19	masser	NF-PM1	B1=2000000, B2=50000000, E=12
2019-04-22	TJAOI	NF	no factor from 2^67 to 2^68
2018-09-04	Joss	NF-PM1	B1=630018, B2=2520072
2018-09-03	Joss	NF-PM1	B1=630018, B2=1890054
2018-08-30	Joss	NF-PM1	B1=630018, B2=1260036
2018-08-29	Joss	NF-PM1	B1=630018
2018-07-24	kkmrkkblmbrbk	C-LL	7FD16187F8E065B3
2017-03-04	Joss	NF-PM1	B1=315009, B2=3150090, E=6
2016-12-29	Joss	NF-PM1	B1=218757
2016-12-18	Joss	NF-PM1	B1=182298
2016-09-25	Adam Buran	NF	no factor from 2^66 to 2^67
2016-09-25	Adam Buran	NF	no factor from 2^65 to 2^66
2016-09-25	Adam Buran	NF	no factor from 2^64 to 2^65
2016-09-25	Adam Buran	NF	no factor from 2^63 to 2^64
2016-09-25	Adam Buran	NF	no factor from 2^62 to 2^63
2016-09-25	Adam Buran	NF	no factor from 2^10 to 2^62
2016-06-12	Joss	NF-PM1	B1=151915, 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
2014-11-12	Joss	NF-PM1	B1=129014
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-18	Grant McCracken	NF	no factor from 2^61 to 2^62
2010-12-08	markr	NF-PM1	B1=105000, B2=2283750, E=6
2010-11-19	Joss	NF-PM1	B1=20000
2009-01-27	Sturle Sunde	NF	no factor from 2^60 to 2^61

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