3 354 371 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁷¹

TF target 2⁶⁴

TF below 2^81 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	6200000
B2 =	22250037810

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	109 / 640

Estimated T-Level: 25.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Brian Schmid	26210426A9854B58	0
Verified	1999-09-22	Kevin Edge	26210426A9854B58	1718282

History

Date	User	Type	Result
2025-06-10	Architects Cubed	NF	no factor from 2^70 to 2^71
2023-05-15	Sid & Andy	NF-PM1	B1=6200000, B2=22250037810
2023-02-13	Joss	NF-PM1	B1=1000000, B2=413676900
2022-09-30	Joss	NF-PM1	B1=1000000, B2=115731000
2022-09-27	TJAOI	NF	no factor from 2^69 to 2^70
2021-06-21	TJAOI	NF	no factor from 2^68 to 2^69
2020-10-12	mikr	NF-PM1	B1=4000000, B2=150000000, E=12
2018-12-17	TJAOI	NF	no factor from 2^67 to 2^68
2017-03-04	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-07-16	Joss	NF-PM1	B1=498873, B2=3990984, E=6
2016-06-20	Joss	NF-PM1	B1=498873, B2=1995492, E=6
2016-06-19	Joss	NF-PM1	B1=498873, B2=997746
2016-05-09	Numberwang	NF-PM1	B1=20000, B2=200000
2016-03-04	ramgeis	NF	no factor from 2^65 to 2^66
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-12-06	Joss	NF-PM1	B1=498873
2015-10-07	Joss	NF-PM1	B1=453521
2015-07-31	Joss	NF-PM1	B1=397787
2015-02-11	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-11	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-23	Joss	NF-PM1	B1=93268
2014-05-19	Joss	NF-PM1	B1=74134
2012-11-15	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-10-11	USAFSS	NF-PM1	B1=55000, B2=907500, E=6
2011-08-19	markr	NF	no factor to 2^62
2009-07-05	Carsten Kossendey	NF-PM1	B1=15000, B2=206250
2009-03-27	S485122	NF	no factor from 2^60 to 2^61

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