254 783 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
86312096230695284555233998622145381207	38	126.0	2025-04-01 13:46:58

ECM

Estimated T-Level: 37.9 ⓘ

TF below 2^121 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	123B	0
Verified (Factored)		Unknown	123B	0
Verified (Factored)		Brian J. Beesley	66CC117861C9123B	0
Verified (Factored)		Eivind Triel	66CC117861C9123B	249994
Verified (Factored)	2001-10-13	Brian J. Beesley	66CC117861C9123B	208052

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2025-04-01	Anton Repko	072A8C03575F4B7F	1	29841	5	3

History

Date	User	Type	Result
2025-04-01	ohne-makler	CERT	PRP Certification Proof certified good
2025-04-01	Anton Repko	C-PRP	M254783/86312096230695284555233998622145381207 : 072A8C03575F4B7F PRP proof power = 5 PRP: Verified Proof certified good
2025-04-01	Anton Repko	F-ECM	Factor: 86312096230695284555233998622145381207 / (ECM curve 826, B1=3000000, B2=22513385895, Edwards Sigma=83274957246152)
2024-03-15	-Anonymous-	NF-PM1	B1=20000000000, B2=7037856387812250
2023-02-11	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=121/29, B1=30000000, B2=960000000
2023-01-27	masser	NF-PP1	Start=2/7, B1=30000000, B2=990000000
2022-03-10	-Anonymous-	NF-PM1	B1=1000000000, B2=202896101968560
2022-01-16	Anton Repko	NF	no factor from 2^66 to 2^70
2021-12-05	Seth_Tr	NF-PM1	B1=120000000, B2=57783635910
2021-12-05	Seth_Tr	NF-PM1	B1=120000000
2020-01-01	Gordon Spence	NF	no factor from 2^65 to 2^66
2018-03-15	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-05-13	Numberwang	NF-PM1	B1=2849, B2=71225
2016-01-30	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-30	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-25	NR	NF	no factor from 2^61 to 2^62
2015-01-16	Denial140	NF-PM1	B1=10000000, B2=250000000, E=12
2013-10-14	David Campeau	NF-PM1	B1=2565000, B2=71820000, E=12
2013-07-23	Sid & Andy	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2445115
2011-02-07	Joss	NF-PM1	B1=2000000
2009-01-24	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-01	Sturle Sunde	NF	no factor from 2^58 to 2^59

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