2 228 507 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
5407601540564521581433	22	72.2	2015-11-23 19:12:41

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)		Andy Kohler	95FAD7C5A8BE19F5	0
Verified (Factored)		Terry Griffin	95FAD7C5A8BE19F5	0
Verified (Factored)		Cornelius Caesar	95FAD7C5A8BE19F5	0
Verified (Factored)	2015-11-15	MadPoo	95FAD7C5A8BE19F5	626641

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	B8D82E2009CFBFEC	1	0	1	3
Verified	2017-10-27	Oliver Kruse	B8D82E2009CFBFEC	1	1277967	1	3

P-1 factors

Date	Factor	B1	B2
2015-11-23	5407601540564521581433	1000000	0

History

Date	User	Type	Result
2017-10-27	Oliver Kruse	C-PRP	M2228507/5407601540564521581433 : B8D82E2009CFBFEC PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M2228507/5407601540564521581433 : B8D82E2009CFBFEC PRP: Verified PRP without proof (not generated)
2016-04-09	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2015-11-23	Alexander Dubrovin	F-PM1	Factor: 5407601540564521581433 / (P-1, B1=1000000)
2015-11-15	MadPoo	C-LL	95FAD7C5A8BE19F5
2015-10-25	ramgeis	NF	no factor from 2^65 to 2^66
2015-05-05	Squeeky_Squirrel	NF-PM1	B1=160000, B2=4600000, E=6
2015-03-06	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-06	VictordeHollander	NF	no factor from 2^63 to 2^64
2014-09-30	Joss	NF-PM1	B1=142602
2014-05-26	Joss	NF-PM1	B1=113801
2013-01-23	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-20	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2011-01-13	Oscar Östlin	NF-PM1	B1=85000, B2=1615000, E=6
2010-10-24	Oscar Östlin	NF-PM1	B1=75011
2009-01-11	Sturle Sunde	NF	no factor from 2^60 to 2^61