6 623 417 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
20948940996511331727662495656962680005679	41	133.9	2020-03-07 01:26:58

ECM

Digits	B1	Curves
25	50000	6 / 280

Estimated T-Level: 20.1 ⓘ

TF below 2^62 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)	1999-03-01	Scott Freeland	B4C4ED183223DB9E	0
Verified (Factored)	2001-06-23	Steve Roffers	B4C4ED183223DB9E	5374202
Verified (Factored)	2015-04-30	MadPoo	B4C4ED183223DB9E	4178858

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2020-03-10	Alvin Bunk	67FEB0F9FD17EB07	1	3323506	5	3
Verified	2020-03-10	ATH	67FEB0F9FD17EB07	1	4269177	5	3

P-1 factors

Date	Factor	B1	B2
2020-03-07	20948940996511331727662495656962680005679	2500000	50000000

History

Date	User	Type	Result
2020-03-10	ATH	C-PRP	M6623417/20948940996511331727662495656962680005679 : 67FEB0F9FD17EB07 PRP: Verified PRP without proof (not generated)
2020-03-10	Alvin Bunk	C-PRP	M6623417/20948940996511331727662495656962680005679 : 67FEB0F9FD17EB07 PRP: Verified PRP without proof (not generated)
2020-03-07	takahashi	F-PM1	Factor: 20948940996511331727662495656962680005679 / (P-1, B1=2500000, B2=50000000, E=6)
2019-02-23	takahashi	NF-PM1	B1=250000, B2=4400000, E=6
2018-02-27	-Anonymous-	NF	no factor from 2^67 to 2^68
2016-04-15	Gordon Spence	NF	no factor from 2^66 to 2^67
2015-11-05	snme2pm1	NF	no factor from 2^65 to 2^66
2015-04-30	MadPoo	C-LL	B4C4ED183223DB9E
2014-07-13	lycorn	NF	no factor from 2^64 to 2^65
2014-06-29	Nesowa	NF	no factor from 2^63 to 2^64
2012-02-27	kurly	NF-PM1	B1=80000, B2=1340000, E=6