1 886 611 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
4773249389495495254995329	25	82.0	2022-10-31 14:24:12

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	107 / 640

Estimated T-Level: 25.8 ⓘ

TF below 2^81 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Linton	8B02764B0665FD8E	0
Verified (Factored)	1999-03-15	Jörg Thomsen	8B02764B0665FD8E	223867
Verified (Factored)	2015-07-14	MadPoo	8B02764B0665FD8E	955545

PRP

Status	Date	User	Residue	Shift	Type	Base
Verified (Factored)	2025-09-02	Kriesel	8719171BDD98AEAD	0	1	3

PRP Cofactor

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2022-10-31	Kevin_9611	8719171BDD98AEAD	1	443126	5	3

History

Date	User	Type	Result
2025-09-03	Carlos Pinho	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	8719171BDD98AEAD PRP proof power = 6 PRP: Verified (Factored) Proof certified good
2022-10-31	K. Jeong	CERT	PRP Certification Proof certified good
2022-10-31	Kevin_9611	C-PRP	M1886611/4773249389495495254995329 : 8719171BDD98AEAD PRP proof power = 7 PRP: Verified Proof certified good
2022-10-31	masser	F-PP1	Start=2/7, B1=800000, Factor: 4773249389495495254995329
2022-10-29	masser	NF-PP1	Start=6/5, B1=400000, B2=10800000
2022-10-27	masser	NF-PP1	Start=86/67, B1=200000, B2=4400000
2019-06-17	TJAOI	NF	no factor from 2^67 to 2^68
2018-05-28	TJAOI	NF	no factor from 2^66 to 2^67
2018-05-02	Joss	NF-PM1	B1=3095866, B2=188661100, E=12
2018-03-13	Joss	NF-PM1	B1=3095866, B2=123834640, E=12
2018-02-16	Joss	NF-PM1	B1=3095866, B2=61917320, E=12
2017-08-04	Joss	NF-PM1	B1=3095866, B2=30958660, E=12
2017-07-30	Joss	NF-PM1	B1=2579889, B2=25798890, E=12
2017-07-20	Joss	NF-PM1	B1=2149908, B2=21499080, E=12
2017-07-18	Joss	NF-PM1	B1=1791590, B2=17915900, E=12
2017-06-19	Joss	NF-PM1	B1=1492992, B2=26873856, E=12
2017-03-01	Joss	NF-PM1	B1=1244160, B2=12441600, E=12
2017-01-21	Joss	NF-PM1	B1=1036800
2016-12-29	Joss	NF-PM1	B1=864000
2016-12-23	Joss	NF-PM1	B1=720000
2016-11-03	Joss	NF-PM1	B1=600000
2016-10-09	Joss	NF-PM1	B1=500000, B2=50000000, E=12
2016-10-07	Joss	NF-PM1	B1=500000, B2=19800000, E=6
2016-09-22	Joss	NF-PM1	B1=500000, B2=16500000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2015-10-07	Bruno Victal	NF-PM1	B1=500000, B2=15000000, E=12
2015-09-13	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-14	MadPoo	C-LL	8B02764B0665FD8E
2015-05-10	snme2pm1	NF	no factor from 2^64 to 2^65
2015-05-10	snme2pm1	NF	no factor from 2^63 to 2^64
2012-01-17	markr	NF-PM1	B1=275000, B2=6000000, E=12
2011-03-08	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-01	Architects Cubed	NF	no factor from 2^60 to 2^61

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