2 206 681 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 =	10000000
B2 =	42796077870

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	135 / 640

Estimated T-Level: 26.1 ⓘ

Status	Date	User	Residue	Shift
Verified		David Marcus	6620BBCD80FF8E89	0
Verified	1999-02-07	Kent Lee	6620BBCD80FF8E89	2143950
Verified	2018-04-16	kkmrkkblmbrbk	6620BBCD80FF8E89	1126552

History

Date	User	Type	Result
2023-07-10	Sid & Andy	NF-PM1	B1=10000000, B2=42796077870
2023-06-04	Joss	NF-PM1	B1=1000000, B2=4524839550
2023-02-10	Joss	NF-PM1	B1=1000000, B2=900310950
2022-12-20	Architects Cubed	NF	no factor from 2^69 to 2^70
2021-07-15	TJAOI	NF	no factor from 2^68 to 2^69
2019-12-18	mikr	NF-PM1	B1=5000000, B2=200000000, E=12
2019-05-06	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-16	kkmrkkblmbrbk	C-LL	6620BBCD80FF8E89
2016-12-12	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
2015-12-07	Alexander Dubrovin	NF-PM1	B1=2000000, B2=65000000, E=12
2015-11-10	Alexander Dubrovin	NF-PM1	B1=2000000, B2=8000000, E=12
2015-11-10	Alexander Dubrovin	NF-PM1	B1=1500000, B2=5500000, E=6
2015-11-09	Alexander Dubrovin	NF-PM1	B1=1000000, B2=2500000, E=6
2015-10-21	ramgeis	NF	no factor from 2^65 to 2^66
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
2014-10-17	Joss	NF-PM1	B1=148172
2014-06-24	Joss	NF-PM1	B1=119086
2013-12-04	LaurV	NF	no factor from 2^62 to 2^63
2011-01-09	markr	NF-PM1	B1=90000, B2=1642500, E=6
2011-01-01	Joss	NF-PM1	B1=30000
2010-11-14	Joss	NF-PM1	B1=20000
2010-11-05	Joss	NF-PM1	B1=15000
2009-01-08	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-03	Sturle Sunde	NF	no factor from 2^60 to 2^61

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