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Old 2006-11-25, 01:27   #6
rogue
 
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"Mark"
Apr 2003
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Quote:
Originally Posted by Citrix View Post
On http://primes.utm.edu/top20/page.php?id=6
There is an open problem to find a cullen prime p*2^p+1 where p is also prime. Has anyone done anywork on this?

I tried to write a crude sieving program. There are ~9000 candidates left under p=5 million when the range is sieved to 350 Million.

Factors available on request.

Is anyone interested in improving on these results. Writing a faster sieve software? Any thoughts on how to solve this problem?

Thanks!
d/l my MultiSieve program. You can build a list of primes into an ABC file (which MultiSieve supports), then start sieving at 2.
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