2 281 327 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 2^81 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	9600000
B2 =	49584025260

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	121 / 640

Estimated T-Level: 25.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Don Groves	B934B687A0A39E5D	0
Verified	1999-03-15	James Arnold	B934B687A0A39E5D	1626275
Verified	2018-04-27	kkmrkkblmbrbk	B934B687A0A39E5D	1695074

History

Date	User	Type	Result
2024-03-29	TJAOI	NF	no factor from 2^69 to 2^70
2023-07-09	Sid & Andy	NF-PM1	B1=9600000, B2=49584025260
2023-03-14	Joss	NF-PM1	B1=1000000, B2=1647746100
2022-11-24	Joss	NF-PM1	B1=1000000, B2=571651080
2021-07-26	TJAOI	NF	no factor from 2^68 to 2^69
2020-11-29	ViliamF	NF-PM1	B1=2000000, B2=60000000
2019-09-08	Yxinity	NF	no factor from 2^67 to 2^68
2018-04-27	kkmrkkblmbrbk	C-LL	B934B687A0A39E5D
2017-02-13	Smok_bmv	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-01-23	Joss	NF-PM1	B1=518948, B2=5189480, E=6
2015-11-01	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
2014-10-06	Joss	NF-PM1	B1=141270
2014-06-11	Joss	NF-PM1	B1=113135
2013-12-06	Jerry Hallett	NF	no factor from 2^62 to 2^63
2012-05-09	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-15	Oscar Östlin	NF-PM1	B1=85000, B2=1742500, E=6
2010-11-24	Oscar Östlin	NF-PM1	B1=75011
2010-11-14	Joss	NF-PM1	B1=20000
2010-11-07	Joss	NF-PM1	B1=15000
2009-01-16	Sturle Sunde	NF	no factor from 2^60 to 2^61

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