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 A030367 #13 Apr 01 2020 01:59:10 %S A030367 1,2,3,9,1,19,2,6,23,3,15,22,9,10,18,1,5,19,57,55,2,8,17,68,7,6,80,51, %T A030367 23,13,64,3,223,15,95,22,63,318,49,141,9,85,10,39,18,59,54,1,47,76,67, %U A030367 35,5,90,19,99,175,60,57,55,158,417,29,2,129 %N A030367 a(n) is the least k such that the base-3 representation of n begins at s(k), where s=A030363. %Y A030367 Cf. A030363. %K A030367 nonn,base %O A030367 1,2 %A A030367 _Clark Kimberling_ %E A030367 a(33) onward corrected by _Sean A. Irvine_, Mar 31 2020