289 019 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
2603285043383033201851147543	28	91.1	2015-12-21 03:30:20

ECM

Digits	B1	Curves
25	50000	280 / 280
30	250000	498 / 640

Estimated T-Level: 28.9 ⓘ

TF below 2^91 is very unlikely to find new factors due to ECM effort.

Status	Date	User	Residue	Shift
Verified (Factored)		David Slowinski	4D30	0
Verified (Factored)		Unknown	4D30	0
Verified (Factored)		Guillermo Ballester Valor	4415430BB4684D30	0
Verified (Factored)		Brian J. Beesley	4415430BB4684D30	0
Verified (Factored)		Eivind Triel	4415430BB4684D30	191419

Status	Date	User	Residue	Number of known factors	Shift	Type	Base
Verified	2017-09-22	Oliver Kruse	FC24170F33FEA023	1	0	1	3
Verified	2017-10-12	Oliver Kruse	FC24170F33FEA023	1	4406	1	3
Verified	2017-11-06	kkmrkkblmbrbk	FC24170F33FEA023	1	114761	1	3
Unverified (Reliable)	2020-04-17	Oliver Kruse	CE5D386085887A__	1	213348	5	3

History

Date	User	Type	Result
2022-03-07	LordJulius	NF	no factor from 2^54 to 2^55
2020-04-17	Oliver Kruse	C-PRP	M289019/2603285043383033201851147543 : CE5D386085887A__ PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-11-06	kkmrkkblmbrbk	C-PRP	M289019/2603285043383033201851147543 : FC24170F33FEA023 PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-10-12	Oliver Kruse	C-PRP	M289019/2603285043383033201851147543 : FC24170F33FEA023 PRP: Unverified (Reliable) PRP without proof (small exponent)
2017-09-22	Oliver Kruse	C-PRP	M289019/2603285043383033201851147543 : FC24170F33FEA023 PRP: Unverified (Reliable) PRP without proof (not generated)
2017-09-22	Oliver Kruse	C-PRP	M289019/2603285043383033201851147543 : FC24170F33FEA023 PRP without proof (not generated)
2015-12-21	bam	F-ECM	Factor: 2603285043383033201851147543 / (ECM curve 3, B1=250000, B2=25000000)
2015-08-13	NR	NF	no factor from 2^61 to 2^62
2013-06-27	lycorn	NF	no factor from 2^60 to 2^61
2012-08-09	markr	NF-PM1	B1=12000000, B2=500000000, E=12
2011-07-26	Joss	NF-PM1	B1=1661088
2009-01-26	Sturle Sunde	NF	no factor from 2^59 to 2^60
2009-01-05	Sturle Sunde	NF	no factor from 2^58 to 2^59