2 851 661 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
5900380182717959745847	22	72.3	2020-01-27 06:51:24

ECM

Digits	B1	Curves
25	50000	93 / 280

Estimated T-Level: 21.7 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Ethan Hansen	56DBAA380025A6C0	0
Verified (Factored)	1999-10-07	MIT dept. of Univ. of Jyvaskyla	56DBAA380025A6C0	2622101
Verified (Factored)	2018-09-17	kkmrkkblmbrbk	56DBAA380025A6C0	1883740

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-01-27	SRJ2877	A840CF9322DF415B	1	2194789	5	3
Verified	2020-02-01	oodaira	A840CF9322DF415B	1	1664484	5	3

History

Date	User	Type	Result
2020-02-01	oodaira	C-PRP	M2851661/5900380182717959745847 : A840CF9322DF415B PRP: Verified PRP without proof (not generated)
2020-01-27	SRJ2877	C-PRP	M2851661/5900380182717959745847 : A840CF9322DF415B PRP: Verified PRP without proof (not generated)
2020-01-27	SRJ2877	F-ECM	Factor: 5900380182717959745847 / (ECM curve 75, B1=50000, B2=5000000)
2019-10-26	masser	NF-PM1	B1=2860000, B2=28600000, E=12
2019-01-07	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-17	kkmrkkblmbrbk	C-LL	56DBAA380025A6C0
2018-09-05	Joss	NF-PM1	B1=857988, B2=2573964, E=6
2018-09-03	Joss	NF-PM1	B1=857988, B2=1715976, E=6
2018-01-22	Joss	NF-PM1	B1=574992
2017-11-05	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-12	Joss	NF-PM1	B1=332750, B2=3327500, E=6
2016-12-20	Joss	NF-PM1	B1=199650
2016-09-16	Joss	NF-PM1	B1=166375, B2=3059375, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-16	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-31	markr	NF	no factor from 2^61 to 2^62
2011-02-04	markr	NF-PM1	B1=125000, B2=2781250, E=6
2011-01-26	Joss	NF-PM1	B1=50000
2011-01-03	Joss	NF-PM1	B1=30000
2010-12-22	Joss	NF-PM1	B1=20000
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=157500
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61

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