mersenneforum.org POST LOTS AND LOTS OF PRIMES HERE
 Register FAQ Search Today's Posts Mark Forums Read

2020-02-06, 12:49   #1926
paulunderwood

Sep 2002
Database er0rr

353210 Posts

Quote:
 Originally Posted by pepi37 What was last prime in that sequence?
Code:
-----  -------------------------------- ------- ----- ---- --------------
rank           description              digits  who year comment
-----  -------------------------------- ------- ----- ---- --------------
673  69*2^3140225-1                    945304 L3764 2014
696  69*2^3097340-1                    932395 L3764 2014
1004  69*2^2649939-1                    797713 L3764 2014
-----  -------------------------------- ------- ----- ---- --------------

2020-02-08, 00:34   #1927
storm5510
Random Account

Aug 2009
U.S.A.

22×449 Posts

Quote:
 Originally Posted by VBCurtis You should use the "post small primes... here" thread for primes smaller than the top-5000 list cutoff, presently in the vicinity of 2^1.4M...
Curious. Where is the top 5000 list?

2020-02-08, 02:12   #1928
paulunderwood

Sep 2002
Database er0rr

22×883 Posts

Quote:
 Originally Posted by storm5510 Curious. Where is the top 5000 list?
https://primes.utm.edu/primes/home.php

2020-02-08, 15:54   #1929
storm5510
Random Account

Aug 2009
U.S.A.

22×449 Posts

Quote:
 Originally Posted by paulunderwood https://primes.utm.edu/primes/home.php
Bookmarked. Thank you!

 2020-02-19, 19:51 #1930 Cruelty     May 2005 31228 Posts 25*2^5152151-1 is prime! (1550954 decimal digits) - I've just noticed that previous prime for this k was reported by me 11+ years ago. Last fiddled with by Cruelty on 2020-02-19 at 20:00
2020-02-19, 20:07   #1931
Cruelty

May 2005

2×809 Posts

Quote:
 Originally Posted by storm5510 I would like to take a look at these. I will look around for them.
There is no point in sieving k*2^n-1 sequences for k<10000, as there are sieve files ready and waiting, read more about it here

2020-02-19, 23:01   #1932
paulunderwood

Sep 2002
Database er0rr

22·883 Posts

Quote:
 Originally Posted by Cruelty 25*2^5152151-1 is prime! (1550954 decimal digits) - I've just noticed that previous prime for this k was reported by me 11+ years ago.
Congrats! Have you been testing k=25 for a solid 11 years, or instead picked it up again recently?

2020-02-19, 23:14   #1933
storm5510
Random Account

Aug 2009
U.S.A.

22×449 Posts

Quote:
 Originally Posted by Cruelty 25*2^5152151-1 is prime! (1550954 decimal digits) - I've just noticed that previous prime for this k was reported by me 11+ years ago.
There is a k = 25 entry in the new Wiki Riesel Prime database. It is unassigned. The last update was in 2014. Perhaps you could claim it and bring it up-to-date?

2020-02-19, 23:30   #1934
Cruelty

May 2005

2·809 Posts

Quote:
 Originally Posted by paulunderwood Congrats! Have you been testing k=25 for a solid 11 years, or instead picked it up again recently?
Solid 11 years This is quite "heavy" k.

2020-02-19, 23:32   #1935
Cruelty

May 2005

161810 Posts

Quote:
 Originally Posted by storm5510 There is a k = 25 entry in the new Wiki Riesel Prime database. It is unassigned. The last update was in 2014. Perhaps you could claim it and bring it up-to-date?
The most up-to-date reservations and statuses are available on mersenneforum.org, and other lists like rieselprime.de or 15k.org are outdated.

 2020-02-20, 09:31 #1936 kar_bon     Mar 2006 Germany 2·1,433 Posts Correct. The rieselprime pages (RPPDb) I won't update anymore. I've only taken the data from there into the Wiki by now, but the next aim is to update all missing primes and current reservations from this forum. I know the problem to update pages for prime collections like RPPDb or 15k.org: the Wiki got the advantage that every logged in user can reserve and update any k-value by themselves including the history, only an admin has to cofirm the changes. To set up the new data will take some time and I see the need to make a note in the Wiki about this: no current data yet.

 Similar Threads Thread Thread Starter Forum Replies Last Post 2147483647 YAFU 3 2016-12-25 21:44 TheMawn Software 18 2014-08-16 03:54 lsoule Riesel Prime Search 1999 2010-03-17 22:33 Peter Hackman Factoring 2 2008-08-15 14:26 jasong Information & Answers 4 2007-10-04 20:40

All times are UTC. The time now is 21:32.

Thu Jan 21 21:32:57 UTC 2021 up 49 days, 17:44, 0 users, load averages: 2.26, 2.49, 2.43