20050621, 11:06  #67 
Jun 2003
11251_{8} Posts 
136588*5^229171 is prime!

20050622, 03:43  #68 
Jun 2003
17·281 Posts 
43156*5^441351 is prime!

20050623, 03:35  #69 
Jun 2003
17×281 Posts 
294698*5^471101 is prime!

20050718, 16:55  #70 
Jul 2005
2·3^{2} Posts 
Another one bites the dust
Prime 9164*5^408921 Is there some other way to check these are primes. As the test has some chance of being wrong.(Am i right?) 8494 and 38348 completed upto 50k without any luck. Btw, Is there some statistics/guesses as to how many will fall till say 50k? I got 2/4. jaat 
20050718, 17:54  #71  
"Mark"
Apr 2003
Between here and the
1772_{16} Posts 
Quote:


20050719, 09:40  #72  
Mar 2003
New Zealand
13·89 Posts 
Quote:
(I moved the last two messages from the reservations thread) 

20050719, 20:21  #73 
Jul 2005
2×3^{2} Posts 
Thanks to both Rogue and geoff for answering the queries. I checked both the numbers with the WinPFGW and they are prime. It is also nice to know that one can knock a very large fraction of them very quickly. I'll get back to them soon.
jaat 
20050814, 05:31  #74 
Mar 2003
New Zealand
13×89 Posts 
I wondered if any of the primes we find could be one of a pair of twin primes of the form k*5^n+/1.
Since in any three consecutive integers one must be divisible by 3, for both k*5^n+1 and k*5^n1 to be prime, k must be divisible by 3. It turns out that this is possible for just one of the k we are currently testing, the Riesel candidate k=151026. Of the primes already found, the two largest twin primes of this form were 110538*5^139+/1 and 136674*5^172+/1. 
20050915, 07:29  #75 
May 2005
Copenhagen, Denmark
121_{16} Posts 
Hey all. I was wondering: Is this project still "alive"? There is not a lot going on in the forum and only geoff has found primes in the last month, so I started to wonder how many people (or GHz) are working on this problem?
I think I'll get back here when I'm finished with my 2721... 
20050917, 15:16  #76 
Mar 2003
New Zealand
13·89 Posts 
I have a part time 2.66GHz P4 that I split between this project and PSP, it usually does 810 hours per week.
It is quiet at the moment, but that is OK, there is no rush :) 
20051011, 07:47  #77 
Jun 2003
12A9_{16} Posts 
99356*5^349941 is prime!

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Sierpinski and Riesel number (Fixed k, Variable base)  Citrix  Sierpinski/Riesel Base 5  16  20170209 15:55 
Definition of Sierpinski/Riesel number base b  sweety439  Conjectures 'R Us  32  20161216 22:31 
Sierpinski/Riesel Base 10  rogue  Conjectures 'R Us  11  20071217 05:08 
Sierpinski / Riesel  Base 23  michaf  Conjectures 'R Us  2  20071217 05:04 
Sierpinski / Riesel  Base 22  michaf  Conjectures 'R Us  49  20071217 05:03 