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 A053749 #19 May 31 2021 10:09:06 %S A053749 5,9,11,32,49,52,62,91,110,131,132,134,142,144,159,173,178,179,180, %T A053749 192,211,214,226,241,253,257,273,305,316,317,326,339,346,356,368,371, %U A053749 380,390,395,405,412,414,416,420 %N A053749 Positions of 5's in the decimal expansion of Pi. %H A053749 Vincenzo Librandi, <a href="/A053749/b053749.txt">Table of n, a(n) for n = 1..1000</a> %H A053749 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a> %F A053749 a(n) = A037004(n) + 1. - _Georg Fischer_, May 31 2021 %t A053749 Flatten[Position[RealDigits[Pi, 10, 1000][[1]], 5]] (* _Vincenzo Librandi_, Oct 07 2013 *) %Y A053749 Cf. A037004. %K A053749 nonn,base %O A053749 1,1 %A A053749 _Simon Plouffe_, Feb 20 2000