Search: id:A035532
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%I A035532
%S A035532 1,2,3,4,7,4,10,8,12,8,18,8,22,12,16,16,31,12,34,16,24,20,41,16,40,24,
%T A035532 36,24,53,16,56,32,40,32,48,24,70,36,48,32,78,24,81,40,48,44,88,32,84,
%U A035532 40,64,48,101,36,80,48,72,56,112,32,116,60,72,64,96,40,130,64,88,48,137
%N A035532 a(n) = 2*phi(n) if n composite, or 2*phi(n) - (A000120(n)-1) if n prime;
               .
%F A035532 G.f.: Sum A005187(n) x^n = Sum a(n)*x^n/(1-x^n).
%t A035532 Insert[Table[If[PrimeQ[n],2*EulerPhi[n] - DigitCount[n, 2][[1]] + 1, 
               2*EulerPhi[n]], {n, 2, 100}], 1, 1] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), 
               Apr 11 2006
%Y A035532 Sequence in context: A139072 A021430 A138676 this_sequence A123498 A123502 
               A073209
%Y A035532 Adjacent sequences: A035529 A035530 A035531 this_sequence A035533 A035534 
               A035535
%K A035532 nonn,easy,nice
%O A035532 1,2
%A A035532 Daniele Parisse (daniele.parisse(AT)m.dasa.de)
%E A035532 More terms from James A. Sellers (sellersj(AT)math.psu.edu)

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