2 948 977 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
561796189464908944632631	24	78.9	2020-09-13 11:54:35

ECM

Digits	B1	Curves
25	50000	21 / 280

Estimated T-Level: 20.4 ⓘ

TF below 2^63 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-05-01	Raleigh Jones	379BE01120553CE3	0
Verified (Factored)	1999-05-30	David Lambert	379BE01120553CE3	1368177
Verified (Factored)	2018-10-12	kkmrkkblmbrbk	379BE01120553CE3	161149

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-09-16	ViliamF	B83886540A916432	1	2881500	5	3

History

Date	User	Type	Result
2020-09-16	Ben Delo	CERT	PRP Certification Proof certified good
2020-09-16	ViliamF	C-PRP	M2948977/561796189464908944632631 : B83886540A916432 PRP proof power = 7 PRP: Verified Proof certified good
2020-09-13	MarkS	F-ECM	Factor: 561796189464908944632631 / (ECM curve 3, B1=50000, B2=5000000, Sigma=6551612102154086)
2018-12-24	chuenkit	NF	no factor from 2^67 to 2^68
2018-10-12	kkmrkkblmbrbk	C-LL	379BE01120553CE3
2017-11-28	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-25	ramgeis	NF	no factor from 2^65 to 2^66
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2015-04-29	VictordeHollander	NF-PM1	B1=1000000, B2=20000000, E=12
2015-04-27	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-27	VictordeHollander	NF	no factor from 2^63 to 2^64
2015-04-08	Joss	NF-PM1	B1=785513
2015-03-14	Joss	NF-PM1	B1=590169
2015-03-12	Joss	NF-PM1	B1=536518
2015-02-23	Joss	NF-PM1	B1=443404
2015-02-15	Joss	NF-PM1	B1=403095
2015-02-11	Joss	NF-PM1	B1=366450
2015-02-03	Joss	NF-PM1	B1=206853
2015-02-01	Joss	NF-PM1	B1=188049
2015-01-30	Joss	NF-PM1	B1=170954
2015-01-26	Joss	NF-PM1	B1=141285
2014-11-10	Joss	NF-PM1	B1=116765
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-12-14	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-11-03	markr	NF-PM1	B1=95000, B2=1971250, E=6
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61

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