2 280 899 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 =	9700000
B2 =	49940763180

ECM

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

Estimated T-Level: 25.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Martin Fahlgren	2D0D436EB973309F	0
Verified	1999-03-15	Stephen Wood	2D0D436EB973309F	1189827
Verified	2018-04-27	kkmrkkblmbrbk	2D0D436EB973309F	1007536

History

Date	User	Type	Result
2024-03-29	TJAOI	NF	no factor from 2^69 to 2^70
2023-08-22	Sid & Andy	NF-PM1	B1=9700000, B2=49940763180
2023-06-28	Joss	NF-PM1	B1=1000000, B2=6752652060
2022-11-18	Joss	NF-PM1	B1=1000000, B2=1310204280
2021-10-28	Aaron Haviland	NF-PM1	B1=630000, B2=18900000, e=12
2021-07-26	TJAOI	NF	no factor from 2^68 to 2^69
2019-09-10	Yxinity	NF	no factor from 2^67 to 2^68
2018-04-27	kkmrkkblmbrbk	C-LL	2D0D436EB973309F
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=518984, B2=5189840, 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=141280
2014-06-11	Joss	NF-PM1	B1=113140
2013-01-23	dbaugh	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
2009-01-15	Sturle Sunde	NF	no factor from 2^60 to 2^61

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