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 A050818 #7 Sep 05 2019 02:12:59 %S A050818 314,1592,6,5358,97932,38,4,62,64,338,32,7950,2,8,84,19716,939937510, %T A050818 58,20,974,94,4592,30,78,16,40,628,620,8998,6280,34,82,534,21170,6798, %U A050818 214,80,86,5132,8230,66,470,938,44,60,9550,582,23172,53594,0,812,848 %N A050818 Even numbers seen in decimal expansion of Pi (disregarding the decimal period) contiguous, smallest and distinct. %C A050818 Leading zero not allowed thus forcing continuation of previous term. %H A050818 C. Rivera, <a href="http://www.primepuzzles.net/problems/prob_018.htm">Problem 18</a>, The Prime Puzzles & Problems Connection. %Y A050818 Cf. A047777, A050817, A016062, A050819, A050807. %K A050818 nonn,easy,base %O A050818 1,1 %A A050818 _Patrick De Geest_, Oct 15 1999