1 826 239 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 =	25000000
B2 =	69189473430

ECM

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

Estimated T-Level: 25.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Jeremy Buhler	BD75D008C6160489	0
Verified	2000-08-10	WeaCheslaw L. Oleinik	BD75D008C6160489	445594
Verified	2015-07-18	MadPoo	BD75D008C6160489	1480009

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-09-02	Kriesel	238BE9D8ED78BF97	0	1	3

History

Date	User	Type	Result
2025-09-03	Philippians-Navin	CERT	PRP Certification CERT proof power = 6 Proof certified good
2025-09-02	Kriesel	C-PRP	238BE9D8ED78BF97 PRP proof power = 6 PRP: Verified Proof certified good
2023-10-06	kurly	NF-PM1	B1=25000000, B2=69189473430
2023-06-06	Joss	NF-PM1	B1=1826239, B2=8774692290
2023-01-08	Joss	NF-PM1	B1=1826239, B2=1642370730
2022-10-29	masser	NF-PP1	Start=2/7, B1=800000, B2=25600000
2022-10-28	masser	NF-PP1	Start=6/5, B1=400000, B2=10800000
2022-10-27	masser	NF-PP1	Start=193/71, B1=200000, B2=4400000
2019-06-24	TJAOI	NF	no factor from 2^67 to 2^68
2018-08-20	Joss	NF-PM1	B1=1826239, B2=182623900, E=12
2018-05-07	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 2^58 to 2^60
2016-02-23	Mark Rose	NF	no factor from 2^61 to 2^62
2015-09-04	ramgeis	NF	no factor from 2^65 to 2^66
2015-07-18	MadPoo	C-LL	BD75D008C6160489
2015-06-14	mikr	NF-PM1	B1=2780000, B2=91760000, E=12
2015-04-25	snme2pm1	NF	no factor from 2^64 to 2^65
2015-04-25	snme2pm1	NF	no factor from 2^63 to 2^64
2014-09-22	Joss	NF-PM1	B1=170292
2014-05-19	Joss	NF-PM1	B1=135146
2011-07-17	GrunwalderGIMP	NF	no factor from 2^1 to 2^63
2011-05-11	kurly	NF-PM1	B1=100000, B2=3000000, E=6
2010-04-10	Architects Cubed	NF	no factor from 2^60 to 2^61

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