2 554 529 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

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 =	20133835260

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	56 / 640

Estimated T-Level: 25.4 ⓘ

Status	Date	User	Residue	Shift
Verified		Robin Smith	FCBFF5C865C6D5C1	0
Verified	1999-04-02	John Wyszynski	FCBFF5C865C6D5C1	2021099
Verified	2018-06-12	kkmrkkblmbrbk	FCBFF5C865C6D5C1	1431019

History

Date	User	Type	Result
2025-06-15	Joss	NF-PM1	B1=10000000, B2=20133835260
2025-04-01	Joss	NF-PM1	B1=10000000, B2=10050107760
2024-04-05	TJAOI	NF	no factor from 2^69 to 2^70
2023-01-10	Architects Cubed	NF-PM1	B1=5000000, B2=8646469650
2021-05-27	TJAOI	NF	no factor from 2^68 to 2^69
2019-06-03	TJAOI	NF	no factor from 2^67 to 2^68
2018-06-12	kkmrkkblmbrbk	C-LL	FCBFF5C865C6D5C1
2017-08-10	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-03-31	mikr	NF-PM1	B1=3200000, B2=112000000, E=12
2016-02-23	Mark Rose	NF	no factor from 2^59 to 2^60
2015-11-04	omylist	NF	no factor from 2^65 to 2^66
2015-02-23	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-23	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-06-16	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-04-09	James Heinrich	NF-PM1	B1=175000, B2=4068750, E=6
2011-01-09	Joss	NF-PM1	B1=50000
2011-01-03	Joss	NF-PM1	B1=30000
2010-12-19	Joss	NF-PM1	B1=20000
2009-01-30	Sturle Sunde	NF	no factor from 2^60 to 2^61

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