This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A361464 #8 Mar 14 2023 18:31:59 %S A361464 6,10,18,21,22,30,32,42,45,46,58,66,68,70,78,82,85,91,93,102,106,114, %T A361464 117,126,128,130,133,138,140,141,150,162,165,166,171,176,178,187,190, %U A361464 198,200,205,210,212,213,214,222,226,234,235,238,248,250,253,261,262,267,270,282,294,301,306,308,310,320 %N A361464 Numbers k such that A135504(k+1) / A135504(k) is a multiple of 4. %C A361464 Numbers k for which A135506(n) == 3 (mod 4). %o A361464 (PARI) isA361464(n) = A361463(n); %Y A361464 Positions of 3's in A361462. %Y A361464 Cf. A135504, A135506, A361461, A361463 (characteristic function). %K A361464 nonn %O A361464 1,1 %A A361464 _Antti Karttunen_, Mar 14 2023