2 157 901 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	148 / 640

Estimated T-Level: 26.2 ⓘ

Status	Date	User	Residue	Shift
Verified		John Lloyd	9F1643D7649FB1BB	0
Verified	1999-02-07	Ethan O'Connor	9F1643D7649FB1BB	1827349
Verified	2018-04-10	kkmrkkblmbrbk	9F1643D7649FB1BB	682242

History

Date	User	Type	Result
2023-10-09	Sid & Andy	NF-PM1	B1=15900000, B2=41466046050
2023-10-08	Joss	NF-PM1	B1=2926761, B2=2961609420
2023-09-16	Joss	NF-PM1	B1=1000000, B2=7960768200
2023-09-05	Numberwang	NF-PM1	B1=205000, B2=2143372140
2023-06-04	Joss	NF-PM1	B1=1000000, B2=3860037720
2021-07-29	TJAOI	NF	no factor from 2^68 to 2^69
2021-06-25	Dylan Delgado	NF-PM1	B1=6000000, B2=906000000
2019-10-01	mikr	NF-PM1	B1=5000000, B2=200000000, E=12
2019-05-13	TJAOI	NF	no factor from 2^67 to 2^68
2018-04-10	kkmrkkblmbrbk	C-LL	9F1643D7649FB1BB
2017-09-13	Joss	NF-PM1	B1=576000, B2=5760000, E=6
2017-09-05	Joss	NF-PM1	B1=480000, B2=4800000, E=6
2016-11-03	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-04-17	Joss	NF-PM1	B1=240000, B2=8841775, 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
2015-03-22	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-22	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-03	Joss	NF-PM1	B1=149744
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2011-01-23	markr	NF-PM1	B1=120000, B2=2340000, E=6
2010-11-10	Joss	NF-PM1	B1=60000
2010-11-07	Joss	NF-PM1	B1=45000
2010-11-07	Joss	NF-PM1	B1=30000
2010-11-04	Joss	NF-PM1	B1=15000
2009-01-06	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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