2 138 327 Exponent Status

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

PrimeNet Exponent Status

M_n

Status

Details

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

Factored

Factor	Digits	Bits	Date
2715488785786338839749205857	28	91.1	2017-10-18 09:56:19

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	165 / 640

Estimated T-Level: 26.3 ⓘ

TF below 2^82 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Robert Friberg	92F15BD55C1785C5	0
Verified (Factored)	1999-02-07	Brian J. Beesley	92F15BD55C1785C5	527219

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-10-18	Oliver Kruse	CD218EA40FDCB85D	1	826479	5	3
Verified	2017-10-18	Yaroslav Berezhko	A1D81B0BD5F08F5E	1	0	1	3
Verified	2017-11-18	kkmrkkblmbrbk	CD218EA40FDCB85D	1	1291334	5	3
Verified	2017-11-23	kkmrkkblmbrbk	A1D81B0BD5F08F5E	1	1801295	1	3

P-1 factors

Date	Factor	B1	B2
2017-10-18	2715488785786338839749205857	2500000	125000000

History

Date	User	Type	Result
2017-11-23	kkmrkkblmbrbk	C-PRP	M2138327/2715488785786338839749205857 : A1D81B0BD5F08F5E PRP: Verified PRP without proof (not generated)
2017-11-18	kkmrkkblmbrbk	C-PRP	M2138327/2715488785786338839749205857 : CD218EA40FDCB85D PRP: Verified PRP without proof (not generated)
2017-10-18	Yaroslav Berezhko	C-PRP	M2138327/2715488785786338839749205857 : A1D81B0BD5F08F5E PRP: Verified PRP without proof (not generated)
2017-10-18	Oliver Kruse	C-PRP	M2138327/2715488785786338839749205857 : CD218EA40FDCB85D PRP: Verified PRP without proof (not generated)
2017-10-18	mikr	F-PM1	Factor: 2715488785786338839749205857 / (P-1, B1=2500000, B2=125000000, E=12)
2016-10-29	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
2015-12-27	ramgeis	NF	no factor from 2^65 to 2^66
2015-03-18	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-03-18	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-12-03	c10ck3r	NF-PM1	B1=500000, B2=10000000, E=12
2013-02-21	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-16	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-11-27	Oscar Östlin	NF-PM1	B1=80000, B2=1500000, E=6
2010-10-26	Oscar Östlin	NF-PM1	B1=75011
2009-01-04	Sturle Sunde	NF	no factor from 2^60 to 2^61