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%I #11 Jul 09 2018 03:09:30
%S 1,1,1,1,3,1,5,3,4,2,9,2,11,4,5,7,15,4,17,6,9,8,21,6,18,10,16,10,27,5,
%T 29,15,17,14,21,10,35,16,21,14,39,9,41,18,21,20,45,14,40,18,29,22,51,
%U 16,37,22,33,26,57,13,59,28,33,31,45,17,65,30,41,21,69,22,71,34,37,34
%N a(n) = A000010(n) - A061498(n).
%o (PARI) a061498(n) = {my(va = select(x->(gcd(n, x)==1), [1..n])); vd = vector(#va-1, k, va[k+1] - va[k]); #Set(vd);}
%o a(n) = eulerphi(n) - a061498(n); \\ _Michel Marcus_, Jul 08 2018
%Y Cf. A000010, A061498.
%K nonn
%O 1,5
%A _Labos Elemer_, Oct 09 2002
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