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 A037975 #6 Jul 26 2015 12:04:30 %S A037975 40,80,81,120,122,161,162,202,240,241,244,245,283,323,324,360,361,362, %T A037975 366,367,368,404,405,445,483,484,487,488,526,566,567,606,608,647,648, %U A037975 688,720,721,722,723,724,725,732,733,734,735 %N A037975 Maximal base 3 run length is 4. %Y A037975 Cf. A043277. %K A037975 nonn,base %O A037975 1,1 %A A037975 _Clark Kimberling_