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 A332206 #11 Aug 28 2024 08:02:26 %S A332206 0,1,3,4,12,13,15,16,48,49,51,52,60,61,63,64,192,193,195,196,204,205, %T A332206 207,208,240,241,243,244,252,253,255,256,768,769,771,772,780,781,783, %U A332206 784,816,817,819,820,828,829,831,832,960,961,963,964,972,973,975,976 %N A332206 Numbers k such that A332205(k) = 0. %C A332206 Although this is a list, it has offset 0 for mathematical reasons. %H A332206 Paolo Xausa, <a href="/A332206/b332206.txt">Table of n, a(n) for n = 0..10000</a> %F A332206 a(e + 2*k) = e + 3*A000695(k) for any e = 0..1 and k >= 0. %t A332206 A332206[n_] := Mod[n, 2] + 3*FromDigits[IntegerDigits[Quotient[n, 2], 2], 4]; %t A332206 Array[A332206, 100, 0] (* _Paolo Xausa_, Aug 28 2024, after _Rémy Sigrist_ *) %o A332206 (PARI) a(n) = (n%2) + 3*fromdigits(binary(n\2),4) %Y A332206 Cf. A000695, A332205. %K A332206 nonn,base %O A332206 0,3 %A A332206 _Rémy Sigrist_, Feb 07 2020