255 239 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

No factors below 2⁷⁰

TF target 2⁴⁴

TF below 2^113 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	20000000000
B2 =	7130414388046950

ECM

Estimated T-Level: 35.7 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	449A	0
Verified		Unknown	449A	0
Verified		Brian J. Beesley	B45DCC8787ED449A	0
Verified		Eivind Triel	B45DCC8787ED449A	133810
Verified	2001-10-13	Brian J. Beesley	B45DCC8787ED449A	105814

History

Date	User	Type	Result
2024-03-07	-Anonymous-	NF-PM1	B1=20000000000, B2=7130414388046950
2023-02-11	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=134/11, B1=30000000, B2=960000000
2023-01-27	masser	NF-PP1	Start=2/7, B1=30000000, B2=990000000
2022-04-28	Anton Repko	NF-PM1	B1=1000000000, B2=201454308905850
2022-03-12	Anton Repko	NF	no factor from 2^66 to 2^70
2021-12-05	Seth_Tr	NF-PM1	B1=120000000, B2=57783635910
2021-12-04	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=2854, B2=71350
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=2560000, B2=71680000, E=12
2013-07-25	Sid & Andy	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2439453
2011-02-07	Joss	NF-PM1	B1=2000000
2009-01-25	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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