2 236 807 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 2^82 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	9900000
B2 =	51266636190

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	165 / 640

Estimated T-Level: 26.3 ⓘ

Status	Date	User	Residue	Shift
Verified		Ed Knapton	88984177C08A3096	0
Verified	1999-03-01	mario albanese	88984177C08A3096	2034012
Verified	2018-04-21	kkmrkkblmbrbk	88984177C08A3096	289240

History

Date	User	Type	Result
2023-08-14	Sid & Andy	NF-PM1	B1=9900000, B2=51266636190
2023-05-27	Joss	NF-PM1	B1=1000000, B2=3799936140
2023-02-06	Architects Cubed	NF	no factor from 2^69 to 2^70
2022-12-29	Joss	NF-PM1	B1=1000000, B2=571651080
2021-07-26	TJAOI	NF	no factor from 2^68 to 2^69
2019-04-08	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-21	kkmrkkblmbrbk	C-LL	88984177C08A3096
2016-12-29	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-01-09	Alexander Dubrovin	NF-PM1	B1=2000000, B2=65000000, E=12
2015-12-01	Alexander Dubrovin	NF-PM1	B1=1000000, B2=6000000, E=6
2015-10-25	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-10	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-10	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-30	Joss	NF-PM1	B1=142390
2014-06-01	Joss	NF-PM1	B1=113695
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-21	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-14	Oscar Östlin	NF-PM1	B1=85000, B2=1615000, E=6
2010-11-09	Oscar Östlin	NF-PM1	B1=75011
2009-01-11	Sturle Sunde	NF	no factor from 2^60 to 2^61

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