2 840 087 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

No factors below 2⁷⁰

TF target 2⁶³

TF below 2^80 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	10000000
B2 =	25658054730

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	80 / 640

Estimated T-Level: 25.6 ⓘ

Status	Date	User	Residue	Shift
Bad		Les	60424016B2315F2D	0
Verified	1999-05-09	Simon Broadbent	37E53F3337EAE298	2043636
Bad	1999-09-07	Almasi Jozsef	8A85FADC77578561	141909
Verified	1999-10-21	Andre Kaplan	37E53F3337EAE298	2755593
Verified	2018-09-13	kkmrkkblmbrbk	37E53F3337EAE298	1780677

Status	Date	User	Residue	Shift	Type	Base
Verified	2025-01-09	kkmrkkblmbrbk	873828113A71F3AF	178442	1	3

History

Date	User	Type	Result
2025-01-10	Marvinist	CERT	PRP Certification CERT proof power = 7 Proof certified good
2025-01-09	kkmrkkblmbrbk	C-PRP	873828113A71F3AF PRP proof power = 7 PRP: Verified Proof certified good
2024-02-20	Sid & Andy	NF-PM1	B1=10000000, B2=25658054730
2023-10-22	Joss	NF-PM1	B1=2622209, B2=2873961090
2023-10-22	Joss	NF-PM1	B1=2622209, B2=1246214970
2023-10-21	Joss	NF-PM1	B1=2622209, B2=432341910
2023-09-22	TJAOI	NF	no factor from 2^69 to 2^70
2023-09-18	Joss	NF-PM1	B1=1000000, B2=6339076590
2023-05-23	Joss	NF-PM1	B1=1000000, B2=3034351320
2023-03-10	Joss	NF-PM1	B1=1000000, B2=432341910
2021-07-15	TJAOI	NF	no factor from 2^68 to 2^69
2020-02-05	masser	NF-PM1	B1=5000000, B2=200000000, E=12
2019-10-30	masser	NF-PM1	B1=2850000, B2=28500000, E=12
2019-01-05	chuenkit	NF	no factor from 2^67 to 2^68
2018-09-13	kkmrkkblmbrbk	C-LL	37E53F3337EAE298
2018-09-12	Joss	NF-PM1	B1=656916, B2=2627664
2018-09-05	Joss	NF-PM1	B1=656916, B2=1313832
2018-09-03	Joss	NF-PM1	B1=656916
2018-08-30	Joss	NF-PM1	B1=602578
2017-11-04	Gordon Spence	NF	no factor from 2^66 to 2^67
2017-03-11	Joss	NF-PM1	B1=328458, B2=3284580, E=6
2016-11-03	Joss	NF-PM1	B1=273715
2016-11-03	Joss	NF-PM1	B1=120000
2016-10-28	Joss	NF-PM1	B1=190080
2016-02-23	Mark Rose	NF	no factor from 2^1 to 2^60
2016-02-14	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-21	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-21	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-10	dbaugh	NF	no factor from 2^62 to 2^63
2012-02-01	lycorn	NF	no factor from 2^61 to 2^62
2009-02-14	Sturle Sunde	NF	no factor from 2^60 to 2^61

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