2 617 721 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 =	44960701170

ECM

Digits	B1	Curves
25	50000	205 / 280

Estimated T-Level: 23.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Cornelius Caesar	3D5091073C6AAA39	0
Bad		Morris Thompson	4F021E51D2484790	0
Verified	1999-05-23	Scott Wayne	3D5091073C6AAA39	2555231
Verified	2018-07-07	kkmrkkblmbrbk	3D5091073C6AAA39	1625959

History

Date	User	Type	Result
2024-05-05	Greg	NF	no factor from 2^69 to 2^70
2023-06-19	kurly	NF-PM1	B1=20000000, B2=44960701170
2023-05-31	Joss	NF-PM1	B1=1000000, B2=2987444460
2023-01-06	Architects Cubed	NF	no factor from 2^69 to 2^70
2022-12-02	Joss	NF-PM1	B1=1000000, B2=449428980
2021-05-19	TJAOI	NF	no factor from 2^68 to 2^69
2019-10-14	masser	NF-PM1	B1=2617721, B2=26177210, E=12
2019-04-22	TJAOI	NF	no factor from 2^67 to 2^68
2018-07-07	kkmrkkblmbrbk	C-LL	3D5091073C6AAA39
2017-08-30	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-07-20	Joss	NF-PM1	B1=400000, B2=4000000, E=6
2016-05-23	Joss	NF-PM1	B1=200000, B2=3600000, E=6
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2016-01-17	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-18	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-18	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-12	Joss	NF-PM1	B1=124519
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-19	markr	NF	no factor from 2^61 to 2^62
2010-12-12	markr	NF-PM1	B1=100000, B2=2125000, E=6
2010-11-17	Joss	NF-PM1	B1=20000
2009-02-01	Sturle Sunde	NF	no factor from 2^60 to 2^61

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