2 963 621 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
129100189172388639343	21	66.8	2017-12-03 16:23:20

ECM

Digits	B1	Curves
25	50000	110 / 280

Estimated T-Level: 22.0 ⓘ

TF below 2^68 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		Greg Rigole	1532E6C90E05335C	0
Verified (Factored)	1999-05-09	chris clark	1532E6C90E05335C	2554618

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-12-04	kkmrkkblmbrbk	C5E31B30DF5F8201	1	1312137	5	3
Verified	2017-12-05	Yaroslav Berezhko	C5E31B30DF5F8201	1	1013028	5	3
Verified	2017-12-06	Oliver Kruse	C5E31B30DF5F8201	1	859356	5	3

History

Date	User	Type	Result
2017-12-06	Oliver Kruse	C-PRP	M2963621/129100189172388639343 : C5E31B30DF5F8201 PRP: Verified PRP without proof (not generated)
2017-12-05	Yaroslav Berezhko	C-PRP	M2963621/129100189172388639343 : C5E31B30DF5F8201 PRP: Verified PRP without proof (not generated)
2017-12-04	kkmrkkblmbrbk	C-PRP	M2963621/129100189172388639343 : C5E31B30DF5F8201 PRP: Verified PRP without proof (not generated)
2017-12-03	Gordon Spence	F	Factor: 129100189172388639343 / TF: 66-67
2016-02-26	ramgeis	NF	no factor from 2^65 to 2^66
2015-05-02	VictordeHollander	NF-PM1	B1=1000000, B2=20000000, E=12
2015-04-29	VictordeHollander	NF	no factor from 2^64 to 2^65
2015-04-29	VictordeHollander	NF	no factor from 2^63 to 2^64
2013-01-07	dbaugh	NF	no factor from 2^62 to 2^63
2011-12-03	Grant McCracken	NF	no factor from 2^61 to 2^62
2010-10-30	markr	NF-PM1	B1=95000, B2=1995000, E=6
2009-02-15	Sturle Sunde	NF	no factor from 2^60 to 2^61