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 A030311 #10 Apr 13 2021 23:27:43 %S A030311 1,1,3,5,1,4,3,17,5,9,1,4,8,3,13,49,17,22,5,31,9,38,1,16,4,8,37,3,29, %T A030311 14,13,129,49,55,17,66,22,5,33,87,31,75,9,106,38,1,11,48,16,21,4,30,8, %U A030311 37,40,15,3,29,36,14,84,13,43,321,129,136,49 %N A030311 Least k such that the base-2 representation of n begins at s(k), where s=A030308. %Y A030311 Cf. A030308. %K A030311 nonn %O A030311 1,3 %A A030311 _Clark Kimberling_