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 A033020 #13 Aug 13 2021 07:27:09 %S A033020 8,16,24,32,40,48,57,114,171,228,285,342,392,400,408,416,424,432,440, %T A033020 784,792,800,808,816,824,832,1176,1184,1192,1200,1208,1216,1224,1568, %U A033020 1576,1584,1592,1600,1608,1616,1960,1968,1976 %N A033020 Numbers whose base-7 expansion has no run of digits with length < 2. %H A033020 Vincenzo Librandi, <a href="/A033020/b033020.txt">Table of n, a(n) for n = 1..1200</a> %t A033020 Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 7]]]>1&] (* _Vincenzo Librandi_, Feb 05 2014 *) %Y A033020 Cf. A007093. %K A033020 nonn,base %O A033020 1,1 %A A033020 _Clark Kimberling_