3 148 477 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 =	10400000
B2 =	19988486700

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	117 / 640

Estimated T-Level: 25.9 ⓘ

Status	Date	User	Residue	Shift
Verified		Philip J. Smith	1DB00CFF5843B5CD	0
Verified	1999-09-07	Viatcheslav Sapronenko	1DB00CFF5843B5CD	1704046

History

Date	User	Type	Result
2025-07-12	Architects Cubed	NF	no factor from 2^70 to 2^71
2023-03-31	Sid & Andy	NF-PM1	B1=10400000, B2=19988486700
2023-01-27	TJAOI	NF	no factor from 2^69 to 2^70
2022-10-30	Joss	NF-PM1	B1=1000000, B2=265074810
2022-09-27	Joss	NF-PM1	B1=1000000, B2=118249950
2021-03-30	TJAOI	NF	no factor from 2^68 to 2^69
2019-04-10	mikr	NF-PM1	B1=3000000, B2=100000000, E=12
2018-12-24	TJAOI	NF	no factor from 2^67 to 2^68
2018-07-15	Joss	NF-PM1	B1=636000, B2=7632000
2017-04-19	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-11-15	Squeeky_Squirrel	NF-PM1	B1=195000, B2=5460000, E=12
2015-06-17	Tha	NF	no factor from 2^65 to 2^66
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
2013-09-02	Squeeky_Squirrel	NF-PM1	B1=110000, B2=2475000, E=6
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-11-03	markr	NF	no factor from 2^61 to 2^62
2011-09-06	Squeeky_Squirrel	NF-PM1	B1=55000, B2=935000, E=6
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=183750
2009-04-12	S485122	NF	no factor from 2^60 to 2^61

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