2 851 621 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
42219407870575926034769	23	75.2	2019-04-11 20:22:25

ECM

Digits	B1	Curves
25	50000	17 / 280

Estimated T-Level: 20.3 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Ethan Hansen	BC598C3D21928C75	0
Verified (Factored)	1999-06-26	BitBucket	BC598C3D21928C75	2561716
Verified (Factored)	2018-09-17	kkmrkkblmbrbk	BC598C3D21928C75	98503

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-04-13	Chang Chia-Tche	CDC353DC36FD18CB	1	2551105	5	3
Verified	2019-04-14	kkmrkkblmbrbk	CDC353DC36FD18CB	1	2144754	5	3

History

Date	User	Type	Result
2023-04-16	Kevin_9611	NF-PM1	B1=1030000, B2=1196748630
2019-04-14	kkmrkkblmbrbk	C-PRP	M2851621/42219407870575926034769 : CDC353DC36FD18CB PRP: Verified PRP without proof (not generated)
2019-04-13	Chang Chia-Tche	C-PRP	M2851621/42219407870575926034769 : CDC353DC36FD18CB PRP: Verified PRP without proof (not generated)
2019-04-11	Claude Portenier	F-ECM	Factor: 42219407870575926034769 / (ECM curve 2, B1=50000, B2=5000000)
2019-01-07	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-17	kkmrkkblmbrbk	C-LL	BC598C3D21928C75
2018-09-05	Joss	NF-PM1	B1=857988, B2=2573964, E=6
2018-09-03	Joss	NF-PM1	B1=857988, B2=1715976, E=6
2018-01-22	Joss	NF-PM1	B1=574992
2017-11-05	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-12	Joss	NF-PM1	B1=332750, B2=3327500, E=6
2016-12-20	Joss	NF-PM1	B1=199650
2016-09-16	Joss	NF-PM1	B1=166375, B2=3059375, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-16	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-01-31	markr	NF	no factor from 2^61 to 2^62
2011-02-04	markr	NF-PM1	B1=125000, B2=2781250, E=6
2011-01-26	Joss	NF-PM1	B1=50000
2011-01-03	Joss	NF-PM1	B1=30000
2010-12-22	Joss	NF-PM1	B1=20000
2009-07-03	Carsten Kossendey	NF-PM1	B1=15000, B2=157500
2009-02-13	Sturle Sunde	NF	no factor from 2^60 to 2^61

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