3 185 857 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 2^80 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	72 / 640

Estimated T-Level: 25.6 ⓘ

Status	Date	User	Residue	Shift
Verified	1998-06-14	Gerrit Hurenkamp	39D8B6FDFF438DA1	0
Verified	1999-05-30	Keith O'Dell	39D8B6FDFF438DA1	1936003

History

Date	User	Type	Result
2025-07-16	Architects Cubed	NF	no factor from 2^70 to 2^71
2023-03-05	Sid & Andy	NF-PM1	B1=10200000, B2=19598847450
2023-02-25	Joss	NF-PM1	B1=1000000, B2=380789640
2022-11-18	TJAOI	NF	no factor from 2^69 to 2^70
2022-09-27	Joss	NF-PM1	B1=1000000, B2=118249950
2021-10-09	-Anonymous-	NF-PM1	B1=4800000, B2=144000000, E=12
2021-06-14	TJAOI	NF	no factor from 2^68 to 2^69
2019-10-05	mikr	NF-PM1	B1=4000000, B2=150000000, E=12
2019-01-07	TJAOI	NF	no factor from 2^67 to 2^68
2017-04-30	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-03-15	Joss	NF-PM1	B1=651712, B2=11730816, E=6
2015-12-02	Joss	NF-PM1	B1=543094
2015-11-30	Joss	NF-PM1	B1=493722
2015-11-28	Joss	NF-PM1	B1=448839
2015-06-21	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=100294
2014-06-01	Joss	NF-PM1	B1=80147
2013-01-03	dbaugh	NF	no factor from 2^62 to 2^63
2011-10-20	Grant McCracken	NF	no factor from 2^61 to 2^62
2011-09-13	Squeeky_Squirrel	NF-PM1	B1=60000, B2=975000, E=6
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=191250
2009-04-09	S485122	NF	no factor from 2^60 to 2^61

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