20100716, 15:01  #56 
Just call me Henry
"David"
Sep 2007
Liverpool (GMT/BST)
2^{6}·3·31 Posts 
I came across this thread for the example which is in post 3. Esecially after looking at that thread i don't know how I missed it. Now I think about it more closely (88996/4)*2^2+1=88996*2^0+1 is prime and removes 88996/4 and 88996/2 but not 88996. Sorry for missing the obvious MOB stuff. My excuss is that today was the last day of term at school.
edit: thanks for the interesting history I presume PSP missed the even ks for the second conjecture because of SOB not having any remaining. I only realized that PSP was searching the second conjecture last month. Last fiddled with by henryzz on 20100716 at 15:04 
20100716, 17:22  #57  
May 2007
Kansas; USA
2×3×5×353 Posts 
Quote:
1. PSP is only searching prime k's so would not test even k's. 2. PSP is not searching the 2nd conjecture. That project has not changed other than the fact that they are partnering with PrimeGrid for some of their nranges. As always, they are searching the 1st prime conjecture. 3. It is PrimeGrid's "extended Sierpinsi project" that is searching the 2nd conjecture. They missed searching even k's. 4. I'm fairly certain that PrimeGrid did not test even k's because the original Riesel and Sierp conjectures only stated "odd k's". It likely had nothing to do with the fact that there were no even k's remaining for k<78557. I had forgotten about that thread that you provided the link to. Now i know that the prime that you stated was not coincidence. One note about that: GFNs are not considered in the conjecture just like k's with trivial factors are not. For that reason even though k=65536 does not have a prime, it does not need one nor is it considered the conjecture. It has been agreed by many that a large # of GFNs are unlikely to ever have primes. The starting bases script came in especially handy with the even k search. Since it knows to only search even k's where k+1 is prime, it eliminated a lot of work up front on k's where an associated odd k would have (or eventually have) the same prime with a slightly different nvalue. Last fiddled with by gd_barnes on 20100716 at 17:41 

20101113, 08:20  #58 
May 2007
Kansas; USA
2·3·5·353 Posts 
Karsten, Max, and/or Vmod,
My apologies for dragging my feet on this: So that I don't have to search around for them, could whomever sees this first provide me with links to the various "cool" webpages that you guys have worked on that contain: 1. A condensed summary of the bases done by Karsten. 2. Bases with 1/2/3 k's remaining done by Karsten. 3. All of the excellent stats on the various bases done by Vmod's scripts. Although I may not have given the impression previously, I believe these are all excellent pages that will make the project more interesting to future searchers. What I will do is add them as links in the 1st post here after the reservations links so that people see them quickly when first visiting the project. Thanks! Gary Last fiddled with by gd_barnes on 20101113 at 08:20 
20101113, 10:07  #59  
Mar 2006
Germany
29·101 Posts 
Quote:
No.2 is included in No.1 with different colors, a separate page is not shown. 

20101114, 05:21  #60 
May 2007
Kansas; USA
2·3·5·353 Posts 
Thanks Karsten. Links are now provided in the 1st posting here under "General short summary pages". Both are now very nice automated summarized lists for the project and should encourage future searchers to break some CRUS records or fill in some holes.
Last fiddled with by gd_barnes on 20101114 at 05:21 
20110119, 19:18  #61  
Jun 2009
2^{2}×173 Posts 
Quote:
Just for fun I tried b=150, n=2 and it gave me thousands of primes. I feel quite flooded and don't know what to do with them. Thanks Peter Thanks a lot, Peter 

20110119, 20:16  #62  
"Mark"
Apr 2003
Between here and the
3^{2}×5^{2}×29 Posts 
Quote:


20110119, 20:18  #63 
Jun 2009
2^{2}·173 Posts 
Thanks!

20110119, 20:48  #64  
May 2007
Kansas; USA
2·3·5·353 Posts 
I realize there is a lot to digest in the software thread. For starting new bases, here is a snippet that will narrow it down for you:
Quote:
Last fiddled with by gd_barnes on 20110119 at 20:49 

20110120, 17:38  #65 
Jun 2009
2^{2}×173 Posts 
Thank you! One last question: when using the script for starting a new base, will kmin equal 1 or 2? 2 is default, is 1 excluded for some reason?

20110120, 17:51  #66 
Mar 2007
Austria
2×151 Posts 
IMPORTANT:
ALL Sierp/Riesel bases < 1030 have been searched to some extent. Look here http://www.noprimeleftbehind.net/crus 
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