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 A033016 #16 Aug 13 2021 19:12:20 %S A033016 4,8,13,26,36,40,44,72,76,80,108,117,121,125,134,216,229,234,238,242, %T A033016 324,328,332,351,360,364,368,377,396,400,404,648,652,656,684,688,692, %U A033016 702,715,720,724,728,972,976,980,985,998,1053 %N A033016 Numbers whose base-3 expansion has no run of digits with length < 2. %H A033016 Vincenzo Librandi, <a href="/A033016/b033016.txt">Table of n, a(n) for n = 1..1000</a> %t A033016 Select[Range[10000], Min[Length/@Split[IntegerDigits[#, 3]]]>1&] (* _Vincenzo Librandi_, Feb 05 2014 *) %Y A033016 Cf. A007089. Supersequence of A033001. %K A033016 nonn,base %O A033016 1,1 %A A033016 _Clark Kimberling_