Search: id:A127955
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%I A127955
%S A127955 178956971,45812984491,733007751851,46912496118443,3002399751580331,
%T A127955 192153584101141163,49191317529892137643,787061080478274202283,
%U A127955 3148244321913096809131,3223802185639011132549803
%N A127955 Composite numbers of the form (2^p+1)/3 where p is a prime.
%C A127955 If p-1 is squarefree, the terms are overpseudoprimes (see A141232). - 
               Vladimir Shevelev (shevelev(AT)bgu.ac.il), Jul 15 2008
%t A127955 a = {}; Do[c = (2^Prime[x] + 1)/3; If[PrimeQ[c] == False, AppendTo[a, 
               c]], {x, 2, 30}]; a
%Y A127955 Cf. A000979, A000978, A124400, A126614, A127956, A127957.
%Y A127955 Sequence in context: A003843 A093047 A093046 this_sequence A047738 A079323 
               A061440
%Y A127955 Adjacent sequences: A127952 A127953 A127954 this_sequence A127956 A127957 
               A127958
%K A127955 nonn
%O A127955 1,1
%A A127955 Artur Jasinski (grafix(AT)csl.pl), Feb 09 2007

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