2 215 673 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
202431584743763626921	21	67.5	2015-11-14 20:39:30

ECM

Digits	B1	Curves
25	50000	93 / 280

Estimated T-Level: 21.7 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)		Takahiro Shakushi	768C9164CB2F8589	0
Verified (Factored)	1999-02-07	Mike Baraniak	768C9164CB2F8589	1011723

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-30	alpertron	3638509C5C3F5FBF	1	0	1	3
Verified	2017-10-26	Oliver Kruse	3638509C5C3F5FBF	1	969574	1	3

P-1 factors

Date	Factor	B1	B2
2015-11-14	202431584743763626921	1000000	5000000

History

Date	User	Type	Result
2017-10-26	Oliver Kruse	C-PRP	M2215673/202431584743763626921 : 3638509C5C3F5FBF PRP: Verified PRP without proof (not generated)
2017-09-30	alpertron	C-PRP	M2215673/202431584743763626921 : 3638509C5C3F5FBF PRP: Verified PRP without proof (not generated)
2016-04-24	alpertron	NF-PM1	B1=500000, B2=15000000, E=12
2015-11-14	Alexander Dubrovin	F-PM1	Factor: 202431584743763626921 / (P-1, B1=1000000, B2=5000000, E=6)
2015-10-22	ramgeis	NF	no factor from 2^65 to 2^66
2015-04-28	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
2014-09-29	Joss	NF-PM1	B1=142936
2014-05-26	Joss	NF-PM1	B1=113968
2013-02-21	dbaugh	NF	no factor from 2^62 to 2^63
2012-04-18	Sebastian Hornbostel	NF	no factor from 2^61 to 2^62
2010-12-18	Oscar Östlin	NF-PM1	B1=85000, B2=1593750, E=6
2010-10-11	Oscar Östlin	NF-PM1	B1=75011
2009-01-08	Sturle Sunde	NF	no factor from 2^60 to 2^61