427 103 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	D72	0
Verified		Marinus van den Heuvel	E4289C0CCF558D72	0
Verified		Eivind Triel	E4289C0CCF558D72	350665
Verified	2002-02-10	Dennis Pope	E4289C0CCF558D72	36951

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
2023-07-24	Joss	NF-PM1	B1=16340784, B2=88292824620
2023-01-17	masser	NF-PP1	Start=6/5, B1=20000000, B2=640000000
2023-01-15	masser	NF-PP1	Start=2/7, B1=20000000, B2=640000000
2023-01-13	Joss	NF-PM1	B1=16340784, B2=32509276800
2023-01-09	masser	NF-PP1	Start=178/41, B1=20000000, B2=620000000
2022-11-19	Joss	NF-PM1	B1=16340784, B2=16747130400
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
2018-11-18	Joss	NF-PM1	B1=15154336
2017-12-21	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-07-27	Joss	NF-PM1	B1=15054336, B2=602173440, E=12
2016-06-20	Joss	NF-PM1	B1=15054336, B2=301086720, E=12
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-02-08	Joss	NF-PM1	B1=15054336, B2=150543360, E=12
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
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
2008-11-11	Jayson King	NF-PM1	B1=5000000, B2=100000000, E=12

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