248 401 Exponent Status

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
109571374430614466145017143067433593	36	116.4	2025-03-13 12:16:43

ECM

Estimated T-Level: 33.7 ⓘ

TF below 2^107 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	21E4	0
Verified (Factored)		Unknown	21E4	0
Verified (Factored)		Ken Kiefer	2528E6760E6121E4	0
Verified (Factored)		Brian J. Beesley	2528E6760E6121E4	0
Verified (Factored)		Eivind Triel	2528E6760E6121E4	68888
Verified (Factored)	2016-06-01	MadPoo	2528E6760E6121E4	65896

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2025-03-13	lycorn	F3808C5947C1D94B	1	68247	5	3

History

Date	User	Type	Result
2025-03-13	Zhang Bingbing	CERT	PRP Certification Proof certified good
2025-03-13	lycorn	C-PRP	M248401/109571374430614466145017143067433593 : F3808C5947C1D94B PRP proof power = 5 PRP: Verified Proof certified good
2025-03-13	lycorn	F-ECM	Factor: 109571374430614466145017143067433593 / (ECM curve 33, B1=3000000, B2=347636634345, Edwards Sigma=5671918191933760)
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=84/67, B1=30000000, B2=960000000
2022-06-11	Sid & Andy	NF-PM1	B1=120000000, B2=4944168869640
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2019-12-31	Gordon Spence	NF	no factor from 2^65 to 2^66
2018-03-12	Gordon Spence	NF	no factor from 2^64 to 2^65
2016-06-27	Joss	NF-PM1	B1=32252400, B2=645048000, E=12
2016-06-01	MadPoo	C-LL	2528E6760E6121E4
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
2016-01-07	Joss	NF-PM1	B1=32252400, B2=322524000, E=12
2015-08-09	snme2pm1	NF	no factor from 2^61 to 2^62
2013-10-21	David Campeau	NF-PM1	B1=2635000, B2=89590000, E=12
2012-02-26	Joss	NF-PM1	B1=2526877
2011-07-24	Joss	NF-PM1	B1=2021501
2011-02-07	Joss	NF-PM1	B1=2000000
2010-06-01	Architects Cubed	NF	no factor from 2^60 to 2^61
2009-01-26	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

Username
Password