2 615 983 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
15564385503568479602009	23	73.7	2021-07-17 07:28:22

ECM

Digits	B1	Curves
25	50000	162 / 280

Estimated T-Level: 22.9 ⓘ

TF below 2^71 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1998-02-12	Andreas Wallin	FBC886C4BDC632E4	0
Verified (Factored)	1999-04-13	Jonas Frid	FBC886C4BDC632E4	1072188
Verified (Factored)	2002-05-25	Brian J. Beesley	FBC886C4BDC632E4	2404065

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2021-07-18	kutens	FF63BD1193801105	1	2152991	5	3

History

Date	User	Type	Result
2021-07-19	ATH	NF-PP1	Start=2/7, B1=2500000, B2=177500000
2021-07-18	Noodles	CERT	PRP Certification Proof certified good
2021-07-18	kutens	C-PRP	M2615983/15564385503568479602009 : FF63BD1193801105 PRP proof power = 7 PRP: Verified Proof certified good
2021-07-17	kutens	F-ECM	Factor: 15564385503568479602009 / (ECM curve 2, B1=50000, B2=6750000, Sigma=416419564031025)
2021-05-27	TJAOI	NF	no factor from 2^68 to 2^69
2019-10-06	masser	NF-PM1	B1=2615983, B2=26159830, E=12
2019-04-22	TJAOI	NF	no factor from 2^67 to 2^68
2017-08-30	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-22	Joss	NF-PM1	B1=350000, B2=3500000, E=6
2016-12-26	Joss	NF-PM1	B1=214989
2016-12-24	Joss	NF-PM1	B1=179158
2016-12-23	Joss	NF-PM1	B1=149299
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
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-22	markr	NF	no factor from 2^61 to 2^62
2011-04-19	James Heinrich	NF-PM1	B1=175000, B2=4243750, E=6
2011-01-19	Joss	NF-PM1	B1=50000
2009-01-31	Sturle Sunde	NF	no factor from 2^60 to 2^61

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