20070426, 12:33  #12 
Jun 2005
373 Posts 
I didn't check the calcs, basically because I don't have the knowledge to do so, BUT:
Isn't this a more metaphisical question? I mean: Riesel Sieve is probably going to be finished when our grandchildren get old, if there are still grandchildren at this time. I feel it more like the building of a cathedral, where you know that you don't see the finished work, but you do it anyways. So my answer to that question if man will ever know if there is such a cullen prime, is: Perhaps. But he has to try. Yours H. 
20070603, 06:48  #13  
Aug 2006
Monza, Italy
59 Posts 
Math explained
Quote:
Quote:
Last fiddled with by RedGolpe on 20070603 at 06:49 

20070603, 08:24  #14  
Sep 2002
Database er0rr
2^{6}·53 Posts 
Quote:
Thanks for the clarification about the difference between "expectation" and "chance". With Pari/GP I get the sum from k=1.5M for the expected number of prime Cullen primes :
For the last, the maximum candidate is about a 150 million decimal digits Good luck! Last fiddled with by paulunderwood on 20070603 at 08:34 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Chance of living N years? What's the formula for that?  Stargate38  Lounge  19  20120912 11:24 
Percent chance of being prime  henryzz  Math  16  20071111 16:21 
Any chance of an NFSNET client for Intel Mac?  fivemack  NFSNET Discussion  1  20061227 19:42 
remote chance of a problem?  nomadicus  Software  13  20051216 05:40 
Chance to use modern Graphics Cards as..  Marco  Hardware  28  20031102 23:21 