218 233 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 2^114 is very unlikely to find new factors due to ECM effort.

P-1

B1 =	139000000
B2 =	5716695064080

ECM

Estimated T-Level: 35.7 ⓘ

Status	Date	User	Residue	Shift
Verified		Unknown	5D8D	0
Verified		Tom Cattrall	38E4A6EE9577DD8D	0
Verified		Brian J. Beesley	38E4A6EE9577DD8D	0
Verified		Eivind Triel	38E4A6EE9577DD8D	181991
Verified	2016-06-01	MadPoo	38E4A6EE9577DD8D	140931

History

Date	User	Type	Result
2025-05-26	tim s	NF	no factor from 2^66 to 2^67
2025-05-19	Joss	NF-PM1	B1=13686760, B2=39712032360
2023-02-18	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-11	masser	NF-PP1	Start=99/37, 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=139000000, B2=5716695064080
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-12-18	Gordon Spence	NF	no factor from 2^65 to 2^66
2016-07-12	Joss	NF-PM1	B1=22809600, B2=821145600, E=12
2016-06-01	MadPoo	C-LL	38E4A6EE9577DD8D
2016-04-07	Joss	NF-PM1	B1=22809600, B2=410572800, E=12
2016-03-28	Joss	NF-PM1	B1=13685760
2016-03-26	Yxinity	NF	no factor from 2^64 to 2^65
2016-02-25	Joss	NF-PM1	B1=11404800, B2=205286400, E=12
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-22	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-22	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-06-23	snme2pm1	NF	no factor from 2^61 to 2^62
2013-07-31	lycorn	NF	no factor from 2^60 to 2^61
2009-03-23	axn	NF-PM1	B1=5000000, B2=200000000, E=12
2009-01-23	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-01	Sturle Sunde	NF	no factor from 2^58 to 2^59

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