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 A043710 #10 Sep 10 2024 17:40:03 %S A043710 1,2,3,4,5,6,8,16,24,32,40,48,50,51,52,53,54,55,57,63,64,66,67,68,69, %T A043710 70,71,72,74,75,76,77,78,79,80,82,83,84,85,86,87,88,90,91,92,93,94,95, %U A043710 96,99,100,101,102,103,104,105,107,108,109,110 %N A043710 Numbers whose base-7 representation has an odd number of runs. %t A043710 Select[Range[120],OddQ[Length[Split[IntegerDigits[#,7]]]]&] (* _Harvey P. Dale_, Sep 10 2024 *) %K A043710 nonn,base %O A043710 1,2 %A A043710 _Clark Kimberling_