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 A103868 #14 Apr 11 2021 04:05:57 %S A103868 13,14,95,62,35,85,79,39,32,48,26,46,33,38,72,59,20,88,14,79,61,39,99, %T A103868 73,15,50,28,90,47,49,54,29,3,87,61,4,26,68,2,98,89,26,8,43,28,35,24, %U A103868 11,7,76,89,12,84,80,56,31,82,32,60,46,7,39,48,64,90,55,50,28,32,71,52,53 %N A103868 Digital expansion of Pi: numbers from each pair of successive digits, reversed. %C A103868 Seen in some riddles. %H A103868 Vincenzo Librandi, <a href="/A103868/b103868.txt">Table of n, a(n) for n = 1..2500</a> %t A103868 FromDigits@# & /@ (Reverse@# & /@ Partition[ RealDigits[Pi, 10, 200][[1]], 2]) (* _Robert G. Wilson v_, Jun 23 2014 *) %Y A103868 Cf. A000796, A105320. %K A103868 dumb,nonn,base %O A103868 1,1 %A A103868 Brian Bolte (bj.bolte(AT)gmail.com), May 29 2006