427 241 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁸

TF target 2⁴⁴

TF below 2^98 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	80000000
B2 =	1720512333540

ECM

Estimated T-Level: 31.1 ⓘ

Status	Date	User	Residue	Shift
Verified		David Slowinski	284	0
Verified		Marinus van den Heuvel	9BB612C058240284	0
Verified		Eivind Triel	9BB612C058240284	355285
Verified	2002-02-10	Dennis Pope	9BB612C058240284	171078

History

Date	User	Type	Result
2023-10-14	masser	NF-PM1	B1=80000000, B2=1720512333540
2023-08-22	Joss	NF-PM1	B1=20000000, B2=79026767820
2023-05-19	Joss	NF-PM1	B1=3003069, B2=48271423200
2023-01-17	masser	NF-PP1	Start=6/5, B1=20000000, B2=640000000
2023-01-17	masser	NF-PP1	Start=2/7, B1=20000000, B2=640000000
2023-01-15	Joss	NF-PM1	B1=3003069, B2=16747130400
2023-01-10	masser	NF-PP1	Start=141/17, B1=20000000, B2=620000000
2022-02-06	LordJulius	NF	no factor from 2^67 to 2^68
2022-02-06	LordJulius	NF	no factor from 2^66 to 2^67
2018-12-09	Gordon Spence	NF	no factor from 2^65 to 2^66
2017-12-21	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-11-15	Gordon Spence	NF	no factor from 2^63 to 2^64
2015-11-15	Gordon Spence	NF	no factor from 2^62 to 2^63
2013-01-06	markr	NF-PM1	B1=25000000, B2=1000000000, E=12
2012-12-01	dbaugh	NF	no factor from 2^61 to 2^62
2012-11-27	dbaugh	NF	no factor from 2^60 to 2^61
2012-05-29	Joss	NF-PM1	B1=3002069
2011-08-09	Joss	NF-PM1	B1=1000689
2010-08-03	Rob_Dee	NF-PM1	B1=1000000, B2=2000000, E=6
2010-08-02	Rob_Dee	NF-PM1	B1=500000, B2=1000000

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