3 293 387 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 2^76 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	8500000
B2 =	21768755190

ECM

Digits	B1	Curves
25	50000	241 / 280

Estimated T-Level: 24.3 ⓘ

Status	Date	User	Residue	Shift
Verified		Todd Smith	0B999B74DB19DCF5	0
Verified	1999-06-06	Goede Schueler/Christoph Steinbeck	0B999B74DB19DCF5	1950555

History

Date	User	Type	Result
2025-06-26	Architects Cubed	NF	no factor from 2^70 to 2^71
2023-06-20	Sid & Andy	NF-PM1	B1=8500000, B2=21768755190
2023-02-13	Joss	NF-PM1	B1=1000000, B2=837081630
2022-10-30	Joss	NF-PM1	B1=1000000, B2=265074810
2022-09-27	Joss	NF-PM1	B1=1000000, B2=118249950
2021-11-25	TJAOI	NF	no factor from 2^69 to 2^70
2021-08-19	TJAOI	NF	no factor from 2^68 to 2^69
2020-01-21	BigBrother	NF-PM1	B1=3000000, B2=90000000, E=12
2018-11-12	TJAOI	NF	no factor from 2^67 to 2^68
2017-04-08	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-02-19	Joss	NF-PM1	B1=238464, B2=2384640, E=6
2017-02-04	Joss	NF-PM1	B1=198720
2017-01-29	Joss	NF-PM1	B1=165600
2017-01-19	Joss	NF-PM1	B1=138000
2015-07-02	Tha	NF	no factor from 2^65 to 2^66
2013-09-08	Squeeky_Squirrel	NF-PM1	B1=115000, B2=2645000, E=6
2012-12-10	lycorn	NF	no factor from 2^62 to 2^65
2011-09-27	markr	NF	no factor to 2^62
2011-09-26	USAFSS	NF-PM1	B1=60000, B2=1065000, E=6
2009-07-10	Carsten Kossendey	NF-PM1	B1=15000, B2=191250
2009-04-01	S485122	NF	no factor from 2^60 to 2^61

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