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 A215734 #14 Feb 15 2019 15:01:52 %S A215734 1,8,8,7,4,2,8,5,5,7,5,7,4,1,5,7 %N A215734 a(n) is the first digit to appear n times in succession in a power of 5. %Y A215734 Cf. A215728, A045875, A215732. %K A215734 nonn,base,more %O A215734 1,2 %A A215734 _V. Raman_, Aug 22 2012 %E A215734 a(13)-a(14) from _Giovanni Resta_, Apr 19 2016 %E A215734 a(15)-a(16) from _Bert Dobbelaere_, Feb 13 2019