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 A033019 #15 Aug 13 2021 19:54:10 %S A033019 7,14,21,28,35,43,86,129,172,215,252,259,266,273,280,287,504,511,518, %T A033019 525,532,539,756,763,770,777,784,791,1008,1015,1022,1029,1036,1043, %U A033019 1260,1267,1274,1281,1288,1295,1512,1548,1555,1562 %N A033019 Numbers whose base-6 expansion has no run of digits with length < 2. %H A033019 Vincenzo Librandi, <a href="/A033019/b033019.txt">Table of n, a(n) for n = 1..1000</a> %t A033019 Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 6]]]>1&] (* _Vincenzo Librandi_, Feb 05 2014 *) %Y A033019 Cf. A007092. %K A033019 nonn,base %O A033019 1,1 %A A033019 _Clark Kimberling_