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%I #9 Sep 30 2018 10:44:06
%S 0,0,1,1,2,1,2,2,2,3,3,4,3,3,3,4,4,4,4,5,4,5,5,5,6,5,5,5,6,6,6,6,6,6,
%T 6,7,7,8,7,7,7,7,7,7,7,8,8,8,8,8,8,9,8,8,8,9,9,9,9,10,9,9,9,9,9,9,10,
%U 10,10,10,10,10,10,10,10,10,11,10,11,11,11,12
%N a(n) = log_2(A094269(n)).
%C A companion sequence of A094269.
%F phi(A003401(n)) = A094269(n) = 2^a(n).
%o (PARI) for(n=1, 1e4, my(i=eulerphi(n)); if(omega(2*i)==1, print1(logint(i,2), ", ")))
%Y A000010, A003401, A094269.
%K nonn
%O 1,5
%A _Jianing Song_, Sep 28 2018
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