Search: id:A147612
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%I A147612
%S A147612 1,1,0,1,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T A147612 0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U A147612 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N A147612 If n is a Jacobsthal number then 1 else 0.
%C A147612 a(A001045(n)) = 1; a(A147613(n)) = 0.
%H A147612 <a href="Sindx_Ch.html#char_fns">Index entries for characteristic functions</
               a>
%F A147612 a(n) = 0^(j(n,1)*j(n,-1)) with j(n,i) = if n mod 2 = 0 then n else j((n+i)/
               2,-i).
%F A147612 a(n)=A105348(n), n<>1. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Nov 19 2008]
%Y A147612 Sequence in context: A164057 A140820 A167501 this_sequence A080545 A141735 
               A073097
%Y A147612 Adjacent sequences: A147609 A147610 A147611 this_sequence A147613 A147614 
               A147615
%K A147612 nonn
%O A147612 0,1
%A A147612 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 08 2008

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