2 651 581 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
66380462155794807523409	23	75.8	2021-07-15 01:29:32

ECM

Digits	B1	Curves
25	50000	115 / 280

Estimated T-Level: 22.1 ⓘ

TF below 2^68 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Phil Marcelis	90731920C708C85E	0
Verified (Factored)	1999-04-02	Bruce Mitchell	90731920C708C85E	897685
Verified (Factored)	2018-07-19	kkmrkkblmbrbk	90731920C708C85E	1009138

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-07-16	/r/counting	E79007B20F69D353	1	1782724	5	3

History

Date	User	Type	Result
2021-07-16	Ben Delo	CERT	PRP Certification Proof certified good
2021-07-16	/r/counting	C-PRP	M2651581/66380462155794807523409 : E79007B20F69D353 PRP proof power = 7 PRP: Verified Proof certified good
2021-07-15	kutens	F-ECM	Factor: 66380462155794807523409 / (ECM curve 4, B1=50000, B2=6750000, Sigma=7834500562006340)
2021-06-07	TJAOI	NF	no factor from 2^68 to 2^69
2019-11-24	masser	NF-PM1	B1=2000000, B2=50000000, E=12
2019-05-20	TJAOI	NF	no factor from 2^67 to 2^68
2018-07-19	kkmrkkblmbrbk	C-LL	90731920C708C85E
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
2017-01-10	Joss	NF-PM1	B1=206385
2016-12-29	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
2012-05-29	markr	NF	no factor from 2^61 to 2^62
2011-01-19	James Heinrich	NF-PM1	B1=180000, B2=4275000, E=6
2009-06-23	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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