1 791 319 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

No factors below 2⁶⁸

TF target 2⁶¹

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

P-1

B1 =	20000000
B2 =	340095305550

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	106 / 640

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Tom Cage	1E05FC64383461B5	0
Verified	1998-12-06	Ross Murray	1E05FC64383461B5	938750
Verified	2015-07-18	MadPoo	1E05FC64383461B5	1431818

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	4D00A20301D9E709	0	1	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	4D00A20301D9E709 PRP proof power = 6 PRP: Verified Proof certified good
2023-08-09	linament	NF-PM1	B1=20000000, B2=340095305550
2023-08-09	linament	NF-PM1	B1=20000000
2023-05-18	Joss	NF-PM1	B1=1791319, B2=6152939100
2023-02-27	Joss	NF-PM1	B1=1791319, B2=2662806300
2023-01-07	Joss	NF-PM1	B1=1791319, B2=917776860
2022-08-04	masser	NF-PP1	Start=139/59, B1=1600000, B2=57600000
2019-07-24	TJAOI	NF	no factor from 2^67 to 2^68
2018-10-19	Joss	NF-PM1	B1=1791319, B2=197045090, E=12
2018-10-07	Joss	NF-PM1	B1=1791319, B2=179131900, E=12
2018-10-02	Joss	NF-PM1	B1=1791319, B2=143305520, E=12
2018-10-01	Joss	NF-PM1	B1=1791319, B2=125392330, E=12
2017-09-15	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^59 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
2015-09-12	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-18	MadPoo	C-LL	1E05FC64383461B5
2015-07-16	mikr	NF-PM1	B1=3642200, B2=123456789, E=12
2015-05-02	snme2pm1	NF	no factor from 2^64 to 2^65
2015-05-02	snme2pm1	NF	no factor from 2^63 to 2^64
2014-12-02	Joss	NF-PM1	B1=202734
2014-09-02	Joss	NF-PM1	B1=166903
2010-11-18	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-04-19	Architects Cubed	NF	no factor from 2^60 to 2^61

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