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%I #8 May 11 2023 16:56:56
%S 0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,0,1,1,0,0,0,0,0,0,0,1,0,1,0,0,
%T 0,0,0,0,0,0,0,1,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,1,
%U 0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0
%N a(n) = 1 if A135506(n) == 3 (mod 4), otherwise 0.
%H Antti Karttunen, <a href="/A361463/b361463.txt">Table of n, a(n) for n = 1..65537</a>
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%o (PARI)
%o up_to = 100000;
%o A135506list(up_to_n) = { my(v=vector(up_to), x1=1, x2); for(n=2, 1+up_to_n, x2 = x1+lcm(x1, n); v[n-1] = (x2/x1)-1; x1=x2); (v); };
%o v135506 = A135506list(up_to);
%o A135506(n) = v135506[n];
%o A361463(n) = (3==(A135506(n)%4));
%Y Characteristic function of A361464.
%Y Cf. A135506, A361462.
%K nonn
%O 1
%A _Antti Karttunen_, Mar 14 2023
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