1 605 029 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

No factors below 2⁷¹

TF target 2⁶¹

TF below 2^83 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	25000000
B2 =	321034878450

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	195 / 640

Estimated T-Level: 26.5 ⓘ

Status	Date	User	Residue	Shift
Verified		John Qua	AEF85AD67BA5DB72	0
Verified	1998-11-07	Team_HWR	AEF85AD67BA5DB72	50077
Verified	2015-07-20	MadPoo	AEF85AD67BA5DB72	1225972

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	69ADD00D1C02B4D0	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	69ADD00D1C02B4D0 PRP proof power = 6 PRP: Verified Proof certified good
2022-10-15	Naegi Makoto	NF-PM1	B1=25000000, B2=321034878450
2017-03-08	VictordeHollander	NF-PM1	B1=10000000, B2=200000000, E=12
2017-01-09	Joss	NF-PM1	B1=1605029
2016-10-28	Joss	NF-PM1	B1=1054152
2016-10-27	Joss	NF-PM1	B1=878460
2016-10-07	Joss	NF-PM1	B1=500000, B2=36000000, E=6
2016-06-15	Joss	NF-PM1	B1=500000, B2=30000000, 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 2^62 to 2^63
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2015-10-15	ramgeis	NF	no factor from 2^70 to 2^71
2015-10-06	Bruno Victal	NF-PM1	B1=500000, B2=15000000, E=12
2015-07-20	MadPoo	C-LL	AEF85AD67BA5DB72
2014-01-18	Never Odd Or Even	NF	no factor from 2^69 to 2^70
2014-01-18	Never Odd Or Even	NF	no factor from 2^68 to 2^69
2014-01-18	Never Odd Or Even	NF	no factor from 2^67 to 2^68
2014-01-18	Never Odd Or Even	NF	no factor from 2^66 to 2^67
2014-01-18	Never Odd Or Even	NF	no factor from 2^65 to 2^66
2011-12-10	markr	NF-PM1	B1=275000, B2=6000000, E=12
2011-05-07	megavink	NF	no factor from 2^64 to 2^65
2011-05-07	megavink	NF	no factor from 2^63 to 2^64
2010-07-12	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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