%I #9 Apr 22 2022 06:03:47
%S 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N a(n) = 1 if n is a number of the form p * q^2, where p and q are primes with p < q, otherwise 0.
%C a(n) = 1 if n is not a cube of prime and A032742(n) is a square of prime, otherwise 0.
%H Antti Karttunen, <a href="/A353473/b353473.txt">Table of n, a(n) for n = 1..65537</a>
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%F a(n) = A143731(n) * A302048(A032742(n)).
%F a(n) = A353472(n) - A353474(n).
%o (PARI)
%o A032742(n) = if(1==n,n,n/vecmin(factor(n)[,1]));
%o A353473(n) = (!isprimepower(n) && 2==isprimepower(A032742(n)));
%Y Characteristic function of A095990.
%Y Cf. A010055, A032742, A143731, A302048, A353472, A353474.
%K nonn
%O 1
%A _Antti Karttunen_, Apr 21 2022