5 338 657 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
648788563568532377689	21	69.1	2019-02-22 09:24:01

ECM

Digits	B1	Curves
25	50000	9 / 280

Estimated T-Level: 20.2 ⓘ

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

Status	Date	User	Residue	Shift
Verified (Factored)	1998-12-06	Lars Geisler	BFB2CA619D355B2F	0
Verified (Factored)	2000-07-03	Garrett White	BFB2CA619D355B2F	1886099

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2019-02-26	Julian112	7AABD159399C248F	1	4534885	5	3
Verified	2019-02-28	arnaud	7AABD159399C248F	1	1668871	5	3

P-1 factors

Date	Factor	B1	B2
2019-02-22	648788563568532377689	320000	9520000

History

Date	User	Type	Result
2019-02-28	arnaud	C-PRP	M5338657/648788563568532377689 : 7AABD159399C248F PRP: Verified PRP without proof (not generated)
2019-02-26	Julian112	C-PRP	M5338657/648788563568532377689 : 7AABD159399C248F PRP: Verified PRP without proof (not generated)
2019-02-22	USAFSS	F-PM1	Factor: 648788563568532377689 / (P-1, B1=320000, B2=9520000, E=12)
2018-06-19	ramgeis	NF	no factor from 2^67 to 2^68
2016-08-06	Gordon Spence	NF	no factor from 2^66 to 2^67
2015-08-16	snme2pm1	NF	no factor from 2^65 to 2^66
2014-12-25	VictordeHollander	NF	no factor from 2^64 to 2^65
2014-12-25	VictordeHollander	NF	no factor from 2^63 to 2^64
2010-09-17	Squeeky_Squirrel	NF-PM1	B1=60000, B2=960000, E=6
2009-08-23	Carsten Kossendey	NF-PM1	B1=25000, B2=343750
2009-05-27	GrunwalderGIMP	NF	no factor from 2^62 to 2^63