%I #11 Jun 12 2022 15:16:35
%S 1,0,0,0,0,1,0,0,0,1,0,0,0,1,1,0,0,0,0,0,1,1,0,0,0,1,0,0,0,1,0,0,1,1,
%T 1,0,0,1,1,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1,0,1,1,0,0,0,1,0,0,1,1,0,0,
%U 1,1,0,0,0,1,0,0,1,1,0,0,0,1,0,0,1,1,1,0,0,0,1,0,1,1,1,0,0,0,0,0,0,1,0,0,1
%N a(n) = 1 if n is a nonprime squarefree number, otherwise 0.
%H Antti Karttunen, <a href="/A354819/b354819.txt">Table of n, a(n) for n = 1..100000</a>
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%H <a href="/index/Eu#epf">Index entries for sequences computed from exponents in factorization of n</a>
%F a(n) = A008966(n) * (1-A010051(n)).
%F For all n >= 1, a(n) = a(A046523(n)).
%F For all n > 1, a(n) <= A354353(n).
%t a[n_] := If[!PrimeQ[n] && SquareFreeQ[n], 1, 0]; Array[a, 100] (* _Amiram Eldar_, Jun 11 2022 *)
%o (PARI) A354819(n) = ((1!=bigomega(n))&&issquarefree(n));
%Y Characteristic function of A000469.
%Y Cf. A008966, A010051, A046523, A322075, A354353, A354870 (inverse Möbius transform).
%K nonn
%O 1
%A _Antti Karttunen_, Jun 10 2022