1 583 273 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 =	19500000
B2 =	75184667250

ECM

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

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		phil kenny	034AB2E122141C65	0
Verified	1998-11-07	Nuutti Kuosa	034AB2E122141C65	310398
Verified	2015-07-20	MadPoo	034AB2E122141C65	1210434

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	4F20C019F0C872AB	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	4F20C019F0C872AB PRP proof power = 6 PRP: Verified Proof certified good
2023-10-18	Sid & Andy	NF-PM1	B1=19500000, B2=75184667250
2023-05-19	Joss	NF-PM1	B1=10001000, B2=8289448440
2023-02-27	Joss	NF-PM1	B1=10001000, B2=3563469000
2023-01-02	Joss	NF-PM1	B1=10001000, B2=1200523170
2018-06-12	ramgeis	NF	no factor from 2^67 to 2^68
2018-01-08	TJAOI	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-10-11	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-20	MadPoo	C-LL	034AB2E122141C65
2015-04-10	VictordeHollander	NF-PM1	B1=10000000, B2=200000000, E=12
2015-03-02	snme2pm1	NF	no factor from 2^64 to 2^65
2015-03-02	snme2pm1	NF	no factor from 2^63 to 2^64
2013-12-13	David Campeau	NF-PM1	B1=970000, B2=28130000, E=12
2011-02-02	James Heinrich	NF-PM1	B1=85000, B2=1402500, E=6
2010-06-17	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2010-05-05	Architects Cubed	NF	no factor from 2^60 to 2^61

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