3 571 439 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 =	13000000
B2 =	20083733670

ECM

Digits	B1	Curves
25	50000	251 / 280

Estimated T-Level: 24.5 ⓘ

Status	Date	User	Residue	Shift
Verified		Robert Friberg	FEA5FC7342C1924E	0
Verified	1999-08-07	James Martin	FEA5FC7342C1924E	832252

History

Date	User	Type	Result
2025-10-03	Joss	NF-PM1	B1=13000000, B2=20083733670
2025-10-03	Joss	NF-PP1	Start=2/7, B1=1000000, B2=101000000
2025-03-01	Joss	NF-PM1	B1=13000000, B2=10027887870
2022-09-19	mikr	NF-PM1	B1=6000000, B2=7731126942
2022-09-10	Joss	NF-PM1	B1=1000000, B2=200059860
2022-04-11	Joss	NF-PM1	B1=1000000, B2=144599994
2021-11-12	Aaron Haviland	NF-PM1	B1=800000, B2=35000000, e=12
2021-11-03	ArtyomP	NF-PP1	Start=6/5, B1=50000, B2=2500000
2021-11-03	ArtyomP	NF-PP1	Start=2/7, B1=50000, B2=2500000
2021-03-17	-Anonymous-	NF	no factor from 2^70 to 2^71
2021-03-17	-Anonymous-	NF	no factor from 2^69 to 2^70
2020-12-21	axn	NF	no factor from 2^68 to 2^69
2018-11-26	TJAOI	NF	no factor from 2^67 to 2^68
2017-06-19	Joss	NF-PM1	B1=370000, B2=3700000, E=6
2017-01-20	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-04-04	USAFSS	NF-PM1	B1=185000, B2=5041250, E=6
2016-02-26	ramgeis	NF	no factor from 2^65 to 2^66
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2015-01-30	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-01-30	VictordeHollander	NF	no factor from 2^63 to 2^64
2012-07-02	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-12-22	Squeeky_Squirrel	NF-PM1	B1=85000, B2=1572500, E=6
2011-06-21	markr	NF	no factor from 2^61 to 2^62
2009-07-09	Carsten Kossendey	NF-PM1	B1=20000, B2=245000
2009-03-15	S485122	NF	no factor from 2^60 to 2^61

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