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%I #2 Mar 30 2012 18:59:06
%S 1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,3,3,3,3,3,3,5,5,5,5,5,5,5,6,6,6,6,6,6,
%T 6,8,8,8,8,8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,10,10,10,10,10,10,10,11,
%U 11,11,11,11,11,11,11,11,11,11,11,11,11,13,13,13,13,13,13,13,14,14,14,14
%N a(n)=n+2-sum{k=0..n, -mu(k-mod(k^7,7k))}
%C A Moebius septuple count.
%C Numbers appear in septuples or multiples of septuples.
%K easy,nonn
%O 0,15
%A _Paul Barry_, Apr 14 2005
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