2 231 407 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 2^83 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	190 / 640

Estimated T-Level: 26.5 ⓘ

Status	Date	User	Residue	Shift
Verified		Binh Pham	0CBF1A98D3C400D3	0
Verified		Chris Gurnee	0CBF1A98D3C400D3	0
Verified	1999-02-07	Phillip L. Poplin	0CBF1A98D3C400D3	228362

History

Date	User	Type	Result
2024-05-05	Greg	NF	no factor from 2^69 to 2^70
2023-08-13	Sid & Andy	NF-PM1	B1=9900000, B2=51266636190
2023-08-02	Joss	NF-PM1	B1=1000000, B2=6872603430
2023-05-10	Joss	NF-PM1	B1=1000000, B2=3244304910
2023-03-19	Joss	NF-PM1	B1=1000000, B2=1430185680
2023-01-28	Architects Cubed	NF	no factor from 2^69 to 2^70
2022-12-29	Joss	NF-PM1	B1=1000000, B2=526661850
2021-08-02	TJAOI	NF	no factor from 2^68 to 2^69
2019-04-15	TJAOI	NF	no factor from 2^67 to 2^68
2016-12-23	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
2016-01-06	Alexander Dubrovin	NF-PM1	B1=2000000, B2=65000000, E=12
2015-11-25	Alexander Dubrovin	NF-PM1	B1=1000000, B2=10000000, E=12
2015-10-25	ramgeis	NF	no factor from 2^65 to 2^66
2015-05-07	Squeeky_Squirrel	NF-PM1	B1=160000, B2=4600000, E=6
2015-03-06	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-06	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-30	Joss	NF-PM1	B1=142528
2014-05-26	Joss	NF-PM1	B1=113764
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-20	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-13	Oscar Östlin	NF-PM1	B1=85000, B2=1615000, E=6
2010-10-26	Oscar Östlin	NF-PM1	B1=75011
2009-01-10	Sturle Sunde	NF	no factor from 2^60 to 2^61

Username
Password