2 301 281 Exponent Status

Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996

PrimeNet Exponent Status

M_n

Status

Details

Factored

Factor	Digits	Bits	Date
42130660566024049962073	23	75.2	2017-10-19 21:55:46

ECM

Digits	B1	Curves
25	50000	87 / 280

Estimated T-Level: 21.6 ⓘ

TF below 2^67 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Allan Schrum	590FB6F3FA28F989	0
Verified (Factored)	1999-02-21	Stacey Greenstein	590FB6F3FA28F989	1697941

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-20	Yaroslav Berezhko	33AA4D7CF3FEE590	1	562707	5	3
Verified	2017-10-20	Oliver Kruse	33AA4D7CF3FEE590	1	346792	5	3

History

Date	User	Type	Result
2021-04-27	Dylan Delgado	NF-PP1	Start=2/7, B1=2000000, B2=146000000
2021-04-06	ViliamF	NF-PM1	B1=5000000, B2=500000000
2018-02-15	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2017-10-20	Oliver Kruse	C-PRP	M2301281/42130660566024049962073 : 33AA4D7CF3FEE590 PRP: Verified PRP without proof (not generated)
2017-10-20	Yaroslav Berezhko	C-PRP	M2301281/42130660566024049962073 : 33AA4D7CF3FEE590 PRP: Verified PRP without proof (not generated)
2017-10-19	Sid & Andy	F-ECM	Factor: 42130660566024049962073 / (ECM curve 21, B1=50000, B2=5000000)
2017-05-30	Gordon Spence	NF	no factor from 2^66 to 2^67
2016-02-23	Mark Rose	NF	no factor from 2^58 to 2^60
2015-10-21	ramgeis	NF	no factor from 2^65 to 2^66
2015-02-27	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-02-27	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-12-06	Jerry Hallett	NF	no factor from 2^62 to 2^63
2012-05-12	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-02-12	Bud	NF-PM1	B1=500000, B2=10000000, E=12
2009-01-15	Sturle Sunde	NF	no factor from 2^60 to 2^61