226 903 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite: proven not-prime with Lucas-Lehmer test

No factors below 2⁶⁷

TF target 2⁴⁴

TF below 2^104 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	133000000
B2 =	5484937307850

ECM

Estimated T-Level: 32.8 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	2F2E	0
Verified		George Johnston	6B8C5A1575ACAF2E	0
Verified		Brian J. Beesley	6B8C5A1575ACAF2E	0
Verified		Eivind Triel	6B8C5A1575ACAF2E	196876
Verified	2016-06-01	MadPoo	6B8C5A1575ACAF2E	143265

Assigned

Assigned	User	Work Type	Updated
2025-10-11	-Anonymous-	factor ECM small	2025-10-11
2025-10-08	-Anonymous-	factor ECM small	2025-10-08
2025-05-21	Twopointsevenone	factor ECM small	2025-05-21

History

Date	User	Type	Result
2025-05-29	tim s	NF	no factor from 2^66 to 2^67
2023-02-13	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-11	masser	NF-PP1	Start=91/47, B1=30000000, B2=960000000
2023-02-05	masser	NF-PP1	Start=2/7, B1=30000000, B2=990000000
2022-06-11	Sid & Andy	NF-PM1	B1=133000000, B2=5484937307850
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-12-20	Gordon Spence	NF	no factor from 2^65 to 2^66
2018-03-04	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-07-12	Joss	NF-PM1	B1=38586240, B2=771724800, E=12
2016-06-01	MadPoo	C-LL	6B8C5A1575ACAF2E
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-26	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-26	Gordon Spence	NF	no factor from 2^62 to 2^63
2016-01-14	Joss	NF-PM1	B1=38586240, B2=385862400, E=12
2015-07-12	snme2pm1	NF	no factor from 2^61 to 2^62
2013-10-10	David Campeau	NF-PM1	B1=2900000, B2=81200000, E=12
2012-02-17	Joss	NF-PM1	B1=2841564
2011-07-24	Joss	NF-PM1	B1=2273251
2010-06-09	Architects Cubed	NF	no factor from 2^60 to 2^61
2009-01-27	Sturle Sunde	NF	no factor from 2^59 to 2^60
2008-12-31	Sturle Sunde	NF	no factor from 2^58 to 2^59

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