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 A030580 #8 Apr 14 2023 15:44:14 %S A030580 1,1,1,1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,2,1,1, %T A030580 1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,1,1,1, %U A030580 1,1,2,1,1,1,1,1,2,1,1,1,1,1,2,1,2,2,2,2 %N A030580 Length of n-th run of digit 5 in A030567. %Y A030580 Cf. A030567. %K A030580 nonn,base %O A030580 1,10 %A A030580 _Clark Kimberling_