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 A033021 #13 Aug 14 2021 02:15:51 %S A033021 9,18,27,36,45,54,63,73,146,219,292,365,438,511,576,585,594,603,612, %T A033021 621,630,639,1152,1161,1170,1179,1188,1197,1206,1215,1728,1737,1746, %U A033021 1755,1764,1773,1782,1791,2304,2313,2322,2331,2340 %N A033021 Numbers whose base-8 expansion has no run of digits with length < 2. %H A033021 Vincenzo Librandi, <a href="/A033021/b033021.txt">Table of n, a(n) for n = 1..1100</a> %t A033021 Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 8]]]>1&] (* _Vincenzo Librandi_, Feb 05 2014 *) %Y A033021 Cf. A007094. %K A033021 nonn,base %O A033021 1,1 %A A033021 _Clark Kimberling_