258 917 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

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 =	1000000000
B2 =	206658851148750

ECM

Estimated T-Level: 35.6 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	236F	0
Verified		Unknown	236F	0
Verified		Brian J. Beesley	6FAC0C371227236F	0
Verified		Eivind Triel	6FAC0C371227236F	177197
Verified	2001-10-13	Brian J. Beesley	6FAC0C371227236F	7129

History

Date	User	Type	Result
2023-02-07	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=181/53, B1=30000000, B2=990000000
2023-01-18	masser	NF-PP1	Start=2/7, B1=30000000, B2=1020000000
2022-09-11	-Anonymous-	NF-PM1	B1=1000000000, B2=206658851148750
2022-08-13	Anton Repko	NF	no factor from 2^66 to 2^70
2022-06-11	Sid & Andy	NF-PM1	B1=115000000, B2=4753509660900
2022-05-28	LordJulius	NF-PM1	B1=101000000, B2=4167617694240
2020-01-02	Gordon Spence	NF	no factor from 2^65 to 2^66
2018-03-18	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-08-01	Joss	NF-PM1	B1=10360000, B2=911253242, E=12
2016-04-13	Joss	NF-PM1	B1=10360000, B2=455626621, E=12
2016-03-28	Joss	NF-PM1	B1=6837600
2016-03-21	Joss	NF-PM1	B1=5698000
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-31	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-31	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-08-25	NR	NF	no factor from 2^61 to 2^62
2013-08-27	David Campeau	NF-PM1	B1=5180000, B2=196840000, E=12
2013-08-16	Sid & Andy	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2394616
2011-02-11	Joss	NF-PM1	B1=2000000
2009-01-26	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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