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 A030593 #6 Feb 05 2023 18:04:46
%S A030593 22,24,26,71,74,77,125,128,131,179,182,185,196,199,202,205,208,211,
%T A030593 214,217,220,223,226,229,232,233,235,236,238,239,241,244,247,287,290,
%U A030593 293,354,358,362,426,430,434,498,502,506,570,574
%N A030593 Position of n-th 4 in A030588.
%t A030593 Position[Flatten[Table[IntegerDigits[2n-1,6],{n,200}]],4]//Flatten (* _Harvey P. Dale_, Feb 05 2023 *)
%K A030593 nonn
%O A030593 1,1
%A A030593 _Clark Kimberling_