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%I
%S 1,1,1,1,1,1,3,3,3,4,4,4,5,5,5,7,7,7,8,8,8,10,10,10,11,11,11,12,12,12,
%T 12,12,12,14,14,14,15,15,15,17,17,17,17,17,17,18,18,18,19,19,19,21,21,
%U 21,22,22,22,24,24,24,25,25,25,26,26,26,26,26,26,28,28,28,29,29,29,30
%N a(n)=n+2-sum{k=0..n, -mu(k-mod(k^3,3k))}
%C A Moebius triple count.
%C Numbers appear in triples or multiples of triples.
%K easy,nonn
%O 0,7
%A _Paul Barry_, Apr 14 2005
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