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%I
%S 0,0,0,3,0,5,6,0,0,9,10,0,12,0,0,15,0,17,18,0,20,0,0,23,24,0,0,27,0,
%T 29,30,0,0,33,34,0,36,0,0,39,40,0,0,43,0,45,46,0,48,0,0,51,0,53,54,0,
%U 0,57,58,0,60,0,0,63,0,65,66,0,68,0,0,71,72,0,0,75,0,77,78,0,80,0,0,83,0,85
%N Evil numbers in evil places.
%C Evil numbers A001969(n) appear at positions indexed by the evil numbers, 0 otherwise. A001477(n)=A102391(n)+A102392(n).
%F a(n)=if((1+floor(n/2))(1+(-1)^A000120(n))/2=0, 0, n); a(n)=if((1+floor(n/2))(1+(-1)^A010060(n))/2=0, 0, n).
%K easy,nonn
%O 0,4
%A _Paul Barry_, Jan 06 2005
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