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
49_{16} Posts 
Math explained
Quote:
Quote:
Last fiddled with by RedGolpe on 20070603 at 06:49 

20070603, 08:24  #14  
Sep 2002
Database er0rr
7536_{8} 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 

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