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%I #12 Jul 16 2023 09:42:39
%S 0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,0,0,
%T 0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,1,0,0,
%U 0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0
%N a(n) = 1 if n is an even number with an odd number of distinct prime factors, otherwise 0.
%H Antti Karttunen, <a href="/A353674/b353674.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) = A059841(n) * A092248(n).
%F a(n) = A059841(n) - A353674(n).
%F a(n) = A092248(n) - A353673(n).
%t Table[If[EvenQ[n]&&OddQ[PrimeNu[n]],1,0],{n,140}] (* _Harvey P. Dale_, Jul 16 2023 *)
%o (PARI) A353674(n) = (!(n%2) && (omega(n)%2));
%Y Cf. A001221, A059841, A092248, A353672, A353673, A353675.
%Y Characteristic function of A098904.
%Y Cf. also A353556.
%K nonn
%O 1
%A _Antti Karttunen_, May 03 2022
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