251 861 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 =	7045963424449950

ECM

Estimated T-Level: 35.6 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	44D5	0
Verified		Unknown	44D5	0
Verified		Ken Kiefer	63FEED54EC84C4D5	0
Verified		Brian J. Beesley	63FEED54EC84C4D5	0
Verified		Eivind Triel	63FEED54EC84C4D5	140203
Verified	2016-06-01	MadPoo	63FEED54EC84C4D5	742

History

Date	User	Type	Result
2023-04-25	-Anonymous-	NF-PM1	B1=20000000000, B2=7045963424449950
2023-02-11	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=2/7, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=151/17, B1=30000000, B2=960000000
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2022-02-27	-Anonymous-	NF-PM1	B1=1000000000, B2=202896101968560
2021-05-26	Anton Repko	NF	no factor from 2^69 to 2^70
2021-05-26	Anton Repko	NF	no factor from 2^66 to 2^69
2020-01-05	nordi	NF-PM1	B1=120000000, B2=2500000000, E=12
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
2016-06-01	MadPoo	C-LL	63FEED54EC84C4D5
2016-05-13	Numberwang	NF-PM1	B1=2816, B2=70400
2016-01-28	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-28	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
2013-10-13	David Campeau	NF-PM1	B1=2595000, B2=72660000, E=12
2013-07-15	Sid & Andy	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2481959
2011-02-07	Joss	NF-PM1	B1=2000000
2009-01-24	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59

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