2 207 783 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
1742856398011373795599	22	70.6	2015-12-07 05:25:10

ECM

Digits	B1	Curves
25	50000	93 / 280

Estimated T-Level: 21.7 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Filip Verberckmoes	EF6DE3BAA83F5E22	0
Verified (Factored)	1999-02-21	Dennis Williamson	EF6DE3BAA83F5E22	1744771

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	58833B55D756F5DA	1	0	1	3
Verified	2017-10-25	Oliver Kruse	58833B55D756F5DA	1	2023940	1	3

P-1 factors

Date	Factor	B1	B2
2015-12-07	1742856398011373795599	2000000	65000000

History

Date	User	Type	Result
2022-03-09	LordJulius	NF	no factor from 2^1 to 2^60
2017-10-25	Oliver Kruse	C-PRP	M2207783/1742856398011373795599 : 58833B55D756F5DA PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M2207783/1742856398011373795599 : 58833B55D756F5DA PRP: Verified PRP without proof (not generated)
2016-04-15	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2015-12-07	Alexander Dubrovin	F-PM1	Factor: 1742856398011373795599 / (P-1, B1=2000000, B2=65000000, E=12)
2015-11-10	Alexander Dubrovin	NF-PM1	B1=2000000, B2=8000000, E=12
2015-11-10	Alexander Dubrovin	NF-PM1	B1=1500000, B2=5500000, E=6
2015-11-09	Alexander Dubrovin	NF-PM1	B1=1000000, B2=2500000, E=6
2015-10-21	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-06	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-06	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-10-17	Joss	NF-PM1	B1=148144
2014-06-24	Joss	NF-PM1	B1=119072
2013-12-04	LaurV	NF	no factor from 2^62 to 2^63
2011-01-09	markr	NF-PM1	B1=90000, B2=1642500, E=6
2011-01-01	Joss	NF-PM1	B1=30000
2010-11-14	Joss	NF-PM1	B1=20000
2010-11-05	Joss	NF-PM1	B1=15000
2009-01-08	Sturle Sunde	NF	no factor from 2^61 to 2^62
2009-01-02	Sturle Sunde	NF	no factor from 2^60 to 2^61

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