2 683 361 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with both PRP and Lucas-Lehmer tests

No factors below 2⁷⁰

TF target 2⁶³

TF below 2^73 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	20000000
B2 =	54443613840

ECM

Digits	B1	Curves
25	50000	203 / 280

Estimated T-Level: 23.6 ⓘ

Status	Date	User	Residue	Shift
Bad		Andrea Gavazzi	2EE1419449EDA159	0
Bad	1999-06-15	Zsolt FAZEKAS	1E89934E72802318	235505
Verified	1999-09-14	James Struble	BBAF23AFB015B70E	2216649
Verified	2001-03-25	David Campeau	BBAF23AFB015B70E	1380992
Verified	2018-07-26	kkmrkkblmbrbk	BBAF23AFB015B70E	114446

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-01-09	kkmrkkblmbrbk	A1F3919BA8582673	1867305	1	3

History

Date	User	Type	Result
2025-01-10	Xyzzy	CERT	PRP Certification CERT proof power = 7 Proof certified good
2025-01-09	kkmrkkblmbrbk	C-PRP	A1F3919BA8582673 PRP proof power = 7 PRP: Verified Proof certified good
2024-01-19	TJAOI	NF	no factor from 2^69 to 2^70
2023-04-10	kurly	NF-PM1	B1=20000000, B2=54443613840
2023-03-10	Joss	NF-PM1	B1=1000000, B2=457236780
2021-07-26	TJAOI	NF	no factor from 2^68 to 2^69
2019-07-07	BigBrother	NF-PM1	B1=3000000, B2=90000000, E=12
2019-05-13	TJAOI	NF	no factor from 2^67 to 2^68
2018-09-03	Joss	NF-PM1	B1=486633
2018-07-26	kkmrkkblmbrbk	C-LL	BBAF23AFB015B70E
2017-09-13	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-04-07	Joss	NF-PM1	B1=335528, B2=3355280, E=6
2017-01-10	Joss	NF-PM1	B1=233006
2016-12-19	Joss	NF-PM1	B1=194172
2016-06-14	Joss	NF-PM1	B1=161810, B2=4567500, E=6
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-01-26	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-23	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-23	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-14	dbaugh	NF	no factor from 2^62 to 2^63
2012-05-12	markr	NF	no factor from 2^61 to 2^62
2010-12-04	markr	NF-PM1	B1=105000, B2=2283750, E=6
2010-11-20	Joss	NF-PM1	B1=20000
2009-01-30	Sturle Sunde	NF	no factor from 2^60 to 2^61

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