2 291 437 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷⁰

TF target 2⁶²

TF below 2^74 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	9600000
B2 =	49498834770

ECM

Digits	B1	Curves
25	50000	216 / 280

Estimated T-Level: 23.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Simon Burge	97FF6C6FE594760C	0
Verified	1999-07-26	Shane Sanford	97FF6C6FE594760C	776977
Verified	2018-04-29	kkmrkkblmbrbk	97FF6C6FE594760C	864266

History

Date	User	Type	Result
2024-03-15	TJAOI	NF	no factor from 2^69 to 2^70
2023-08-24	Sid & Andy	NF-PM1	B1=9600000, B2=49498834770
2023-07-11	Joss	NF-PM1	B1=1000000, B2=3799936140
2023-03-13	Joss	NF-PM1	B1=1000000, B2=1647746100
2023-01-01	Joss	NF-PM1	B1=1000000, B2=571651080
2021-06-17	TJAOI	NF	no factor from 2^68 to 2^69
2019-07-22	BigBrother	NF-PM1	B1=3000000, B2=90000000, E=12
2019-06-03	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-29	kkmrkkblmbrbk	C-LL	97FF6C6FE594760C
2017-05-20	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-01-01	Joss	NF-PM1	B1=359748, B2=3597480, E=6
2015-11-03	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-12	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-12	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-03	Joss	NF-PM1	B1=141022
2014-06-11	Joss	NF-PM1	B1=113011
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-12	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-16	Oscar Östlin	NF-PM1	B1=85000, B2=1742500, E=6
2010-11-29	Oscar Östlin	NF-PM1	B1=75011
2010-11-15	Joss	NF-PM1	B1=20000
2010-11-07	Joss	NF-PM1	B1=15000
2009-01-14	Sturle Sunde	NF	no factor from 2^60 to 2^61

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