2 164 121 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁹

TF target 2⁶²

TF below 2^82 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	15900000
B2 =	41466046050

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	166 / 640

Estimated T-Level: 26.3 ⓘ

Status	Date	User	Residue	Shift
Verified		Jeff Woods	6E9E67DC0379C078	0
Verified	1999-01-29	David Phillips	6E9E67DC0379C078	658249
Verified	2018-04-11	kkmrkkblmbrbk	6E9E67DC0379C078	222458

History

Date	User	Type	Result
2023-10-09	Sid & Andy	NF-PM1	B1=15900000, B2=41466046050
2023-09-22	Joss	NF-PM1	B1=10000000, B2=1809697890
2023-09-22	Joss	NF-PM1	B1=10000000, B2=627837210
2023-09-16	Joss	NF-PM1	B1=1000000, B2=7960768200
2023-07-06	Joss	NF-PM1	B1=1000000, B2=3860037720
2023-03-06	Joss	NF-PM1	B1=1000000, B2=1809697890
2023-01-29	Joss	NF-PM1	B1=1000000, B2=627837210
2021-07-29	TJAOI	NF	no factor from 2^68 to 2^69
2019-10-24	mikr	NF-PM1	B1=5000000, B2=200000000, E=12
2019-05-13	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-11	kkmrkkblmbrbk	C-LL	6E9E67DC0379C078
2017-09-13	Joss	NF-PM1	B1=576000, B2=5760000, E=6
2017-09-05	Joss	NF-PM1	B1=480000, B2=4800000, E=6
2016-11-10	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-04-21	Joss	NF-PM1	B1=240000, B2=8834302, E=12
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-12-30	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-25	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-25	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-05	Joss	NF-PM1	B1=149658
2013-09-08	ramgeis	NF	no factor from 2^62 to 2^63
2011-01-22	markr	NF-PM1	B1=120000, B2=2370000, E=6
2011-01-15	Joss	NF-PM1	B1=50000
2010-11-07	Joss	NF-PM1	B1=30000
2010-11-04	Joss	NF-PM1	B1=15000
2009-01-08	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-04	Sturle Sunde	NF	no factor from 2^60 to 2^61

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