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 A043711 #10 Jul 07 2025 16:19:54 %S A043711 1,2,3,4,5,6,7,9,18,27,36,45,54,63,65,66,67,68,69,70,71,73,80,81,83, %T A043711 84,85,86,87,88,89,90,92,93,94,95,96,97,98,99,101,102,103,104,105,106, %U A043711 107,108,110,111,112,113,114,115,116,117,119,120 %N A043711 Numbers whose base-8 representation has an odd number of runs. %t A043711 Select[Range[150],OddQ[Length[Split[IntegerDigits[#,8]]]]&] (* _Harvey P. Dale_, Jul 07 2025 *) %K A043711 nonn,base %O A043711 1,2 %A A043711 _Clark Kimberling_