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%I #2 Mar 30 2012 18:59:06
%S 1,1,1,1,1,1,1,1,1,1,3,3,3,3,3,5,5,5,5,5,6,6,6,6,6,7,7,7,7,7,7,7,7,7,
%T 7,9,9,9,9,9,10,10,10,10,10,11,11,11,11,11,12,12,12,12,12,14,14,14,14,
%U 14,15,15,15,15,15,17,17,17,17,17,17,17,17,17,17,18,18,18,18,18,19,19,19
%N a(n)=n+2-sum{k=0..n, -mu(k-mod(k^5,5k))}
%C A Moebius quintuple count.
%C Numbers appear in quintuples or multiples of quintuples.
%K easy,nonn
%O 0,11
%A _Paul Barry_, Apr 14 2005
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