3 198 887 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 2^77 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10200000
B2 =	19598847450

ECM

Digits	B1	Curves
25	50000	254 / 280

Estimated T-Level: 24.5 ⓘ

Status	Date	User	Residue	Shift
Verified		Randy Roebuck	A22FF1CCAD246A0C	0
Verified	1999-10-29	Sam Robertson	A22FF1CCAD246A0C	2552269
Bad	2000-04-12	Bill Herrington	FFBC4878B3A39001	1316349

History

Date	User	Type	Result
2025-07-11	Architects Cubed	NF	no factor from 2^70 to 2^71
2023-04-05	Sid & Andy	NF-PM1	B1=10200000, B2=19598847450
2023-03-05	Joss	NF-PM1	B1=1000000, B2=380789640
2022-09-30	Joss	NF-PM1	B1=1000000, B2=118249950
2022-09-27	TJAOI	NF	no factor from 2^69 to 2^70
2021-06-28	TJAOI	NF	no factor from 2^68 to 2^69
2019-12-03	mikr	NF-PM1	B1=4000000, B2=150000000, E=12
2018-12-17	TJAOI	NF	no factor from 2^67 to 2^68
2018-09-07	Joss	NF-PM1	B1=520300, B2=4162400
2018-09-07	Joss	NF-PM1	B1=520300, B2=3642100
2018-09-05	Joss	NF-PM1	B1=520300, B2=2081200
2018-09-04	Joss	NF-PM1	B1=520300, B2=1560900
2018-09-04	Joss	NF-PM1	B1=520300, B2=1040600
2017-04-30	Gordon Spence	NF	no factor from 2^66 to 2^67
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
2013-01-05	Squeeky_Squirrel	NF-PM1	B1=215000, B2=6235000, E=12
2013-01-03	dbaugh	NF	no factor from 2^62 to 2^63
2011-10-12	Grant McCracken	NF	no factor from 2^61 to 2^62
2009-04-07	S485122	NF	no factor from 2^60 to 2^61

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