238 321 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

Composite, with 1 known prime factor. Cofactor is composite.

Factored

Factor	Digits	Bits	Date
61211903995353517273465589391081911	35	115.6	2024-01-11 09:25:51

ECM

Estimated T-Level: 35.6 ⓘ

TF below 2^113 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	1CAA	0
Verified (Factored)		Unknown	1CAA	0
Verified (Factored)		Brian J. Beesley	7FE4D0C891899CAA	0
Verified (Factored)		Eivind Triel	7FE4D0C891899CAA	82457
Verified (Factored)	2001-09-16	Brian J. Beesley	7FE4D0C891899CAA	84941

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2024-01-11	lycorn	09625CE80B458E56	1	124694	5	3

History

Date	User	Type	Result
2024-01-11	Will K	CERT	PRP Certification Proof certified good
2024-01-11	lycorn	C-PRP	M238321/61211903995353517273465589391081911 : 09625CE80B458E56 PRP proof power = 5 PRP: Verified Proof certified good
2024-01-11	lycorn	F-ECM	Factor: 61211903995353517273465589391081911 / (ECM curve 174, B1=2900000, B2=49529575095, Sigma=3669730884523675)
2023-02-11	masser	NF-PP1	Start=6/5, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=2/7, B1=30000000, B2=990000000
2023-02-05	masser	NF-PP1	Start=96/67, B1=30000000, B2=960000000
2022-06-03	Sid & Andy	NF-PM1	B1=126000000, B2=5214552833490
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-12-29	Gordon Spence	NF	no factor from 2^65 to 2^66
2019-04-06	alex	NF-PM1	B1=100000000, B2=2000000000, E=12
2018-03-09	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-05-13	Numberwang	NF-PM1	B1=2665, B2=66625
2016-02-23	Mark Rose	NF	no factor from 2^57 to 2^58
2016-01-12	Gordon Spence	NF	no factor from 2^63 to 2^64
2016-01-12	Gordon Spence	NF	no factor from 2^62 to 2^63
2015-07-24	snme2pm1	NF	no factor from 2^61 to 2^62
2014-12-15	Denial140	NF-PM1	B1=10000000, B2=250000000, E=12
2013-10-11	David Campeau	NF-PM1	B1=2690000, B2=78010000, E=12
2013-07-22	lycorn	NF	no factor from 2^60 to 2^61
2012-02-26	Joss	NF-PM1	B1=2666314
2011-07-24	Joss	NF-PM1	B1=2133051
2011-02-01	Joss	NF-PM1	B1=2000000
2009-01-23	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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