Search: id:A137780
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%I A137780
%S A137780 3,5,5,17,5,17,5,17,65,5,65,17,5,17,65,65,5,65,17,5,65,17,65,257,17,5,
%T A137780 17,5,17,16385,17,65,5,1025,5,65,65,17,65,65,5,1025,5,17,5,4097,4097,17,
%U A137780 5,17,65,5,1025,65,65,65,5,65,17,5,1025,16385,17,5,17,16385,65,1025,5
%N A137780 a(n) = 1 + 2^( prime(n + 1) - prime(n) ).
%F A137780 a(n) = 1+2^A001223(n) ; A001223(n) = A001511([a(n)/2]) = A007814(a(n)-1)) 
               ; a(n) = 1+4^A028334(n) for n>1. [From M. F. Hasler (MHasler(AT)univ-ag.fr), 
               Apr 21 2009]
%o A137780 (PARI) a(n) = 1 + 2^( prime(n + 1) - prime(n) )
%Y A137780 Sequence in context: A028265 A084041 A028254 this_sequence A079372 A055382 
               A165235
%Y A137780 Adjacent sequences: A137777 A137778 A137779 this_sequence A137781 A137782 
               A137783
%K A137780 nonn
%O A137780 1,1
%A A137780 Alexander R. Povolotsky (pevnev(AT)juno.com), Apr 28 2008
%E A137780 Extended beyond a(30) by M. F. Hasler (MHasler(AT)univ-ag.fr), Apr 21 
               2009

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