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 A043636 #11 Apr 25 2021 12:09:56 %S A043636 538084,538085,538086,538087,538088,538089,538090,538091,538101, %T A043636 538102,538104,538105,538106,538107,538108,538109,538110,538111, %U A043636 538112,538114,538115,538116,538117,538118,538119,538120,538121 %N A043636 Numbers whose base-9 representation has exactly 7 runs. %t A043636 Select[Range[550000],Length[Split[IntegerDigits[#,9]]]==7&] (* _Harvey P. Dale_, Mar 11 2015 *) %Y A043636 Cf. A007095. %K A043636 nonn,base %O A043636 1,1 %A A043636 _Clark Kimberling_