%I A050920
%S A050920 3,393050634124102232869567034555427371542904833
%N A050920 Cullen primes: primes of the form n*2^n+1.
%C A050920 The next term is too large to display here, having 1423 digits. See A005849.
%H A050920 Ray Ballinger, <a href="http://www.prothsearch.net/cullen.html">Cullen 
               Primes: Definition and Status</a>
%H A050920 C. K. Caldwell, <a href="http://www.utm.edu/research/primes/lists/top20/
               Cullen.html">Cullen Primes</a>
%H A050920 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CullenNumber.html">Cullen Number</a>
%t A050920 lst={};Do[If[PrimeQ[p=n*2^n+1], Print[p];AppendTo[lst, p]], {n, 10^9}];
               lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 21 2008]
%Y A050920 See A005849 for more terms.
%Y A050920 Sequence in context: A068740 A058473 A115527 this_sequence A001231 A141150 
               A089418
%Y A050920 Adjacent sequences: A050917 A050918 A050919 this_sequence A050921 A050922 
               A050923
%K A050920 nonn,easy,nice,bref
%O A050920 1,1
%A A050920 N. J. A. Sloane (njas(AT)research.att.com), Dec 30 1999