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 A196032 #16 Mar 22 2025 17:59:23 %S A196032 4,8,12,16,17,18,19,20,24,28,32,33,34,35,36,40,44,48,49,50,51,52,56, %T A196032 60,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,88, %U A196032 92,96,97,98,99,100,104,108,112,113,114,115,116,120,124,128 %N A196032 Numbers having at least one zero in base 4 representation. %H A196032 Reinhard Zumkeller, <a href="/A196032/b196032.txt">Table of n, a(n) for n = 1..10000</a> %t A196032 Select[Range[200], DigitCount[#, 4, 0] > 0 &] (* _Paolo Xausa_, Mar 22 2025 *) %o A196032 (Haskell) %o A196032 a196032 n = a196032_list !! (n-1) %o A196032 a196032_list = filter f [1..] where %o A196032 f 0 = False; f x = m == 0 || f x' where (x',m) = divMod x 4 %o A196032 -- _Reinhard Zumkeller_, Oct 19 2011 %Y A196032 Cf. A023705 (complement). %K A196032 nonn,base %O A196032 1,1 %A A196032 _Reinhard Zumkeller_, Oct 27 2011