3 181 879 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 =	10200000
B2 =	19598847450

ECM

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

Estimated T-Level: 25.9 ⓘ

Status	Date	User	Residue	Shift
Verified	1998-04-15	Stephan Grupp	B685BC5D9A24FB6F	0
Verified	1999-08-07	Andras Posafalvi	B685BC5D9A24FB6F	1264611

History

Date	User	Type	Result
2025-07-17	Architects Cubed	NF	no factor from 2^70 to 2^71
2023-02-25	Sid & Andy	NF-PM1	B1=10200000, B2=19598847450
2022-12-02	TJAOI	NF	no factor from 2^69 to 2^70
2022-10-14	Joss	NF-PM1	B1=1001448, B2=1015265790
2022-02-09	Joss	NF-PM1	B1=1001448, B2=119912100
2021-07-22	TJAOI	NF	no factor from 2^68 to 2^69
2021-02-15	Numberwang	NF-PM1	B1=166000, B2=5240000, E=6
2019-09-19	mikr	NF-PM1	B1=3000000, B2=120000000, E=12
2019-01-07	TJAOI	NF	no factor from 2^67 to 2^68
2017-04-26	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-03-07	Joss	NF-PM1	B1=681448, B2=12266064, E=6
2015-11-21	Joss	NF-PM1	B1=567874
2015-09-17	Joss	NF-PM1	B1=450362
2015-06-18	Tha	NF	no factor from 2^65 to 2^66
2015-02-15	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-15	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-29	Joss	NF-PM1	B1=100344
2014-06-01	Joss	NF-PM1	B1=80172
2013-01-03	dbaugh	NF	no factor from 2^62 to 2^63
2011-10-24	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-09-12	Squeeky_Squirrel	NF-PM1	B1=60000, B2=975000, E=6
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=191250
2009-04-08	S485122	NF	no factor from 2^60 to 2^61

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