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%I #6 Dec 15 2017 17:35:16
%S -1,-1,0,-1,0,0,0,0,0,0,5,0,2,2,6,0,3,2,5,0,0,2,7,5,3,5,9,2,8,6,7,6,
%T 15,5,20,3,15,6,21,5,10,7,15,0,0,6,10,7,14,15,15,3,21,15,20,9,0,6,41,
%U 8,20,14,35,7,14,14,13,15,12,15,54,20,21,20,41,15,16,14,12,21,0,15,30,10,27,21,39,15,54,13,41,0,54,14,75,10,41,21,42,14
%N C(H(n)), where C(n) is Chowla's function (A048050) and H(n) is the half-totient function (A023022).
%o (PARI) C(n)=sigma(n)-n-1; H(n)=eulerphi(n)/2; j=[]; for(n=3,150,j=concat(j,C(H(n)))); j
%Y Cf. A048050, A023022.
%K sign
%O 3,11
%A _Jason Earls_, Jul 21 2001
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