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 A104838 #10 Aug 25 2013 06:04:27
%S A104838 348253421170679821,211706798214808651,81284811174502841,
%T A104838 502841027019385211,334461284756482337,564856692346034861,
%U A104838 917153643678925903,305305488204665213,351885752724891227
%N A104838 Primes from merging of 18 successive digits in decimal expansion of Pi.
%H A104838 Vincenzo Librandi, <a href="/A104838/b104838.txt">Table of n, a(n) for n = 1..1000</a>
%t A104838 With[{pi = FromDigits/@Partition[RealDigits[Pi, 10, 900][[1]], 18, 1]}, Select[pi, PrimeQ]] (* _Vincenzo Librandi_, Apr 21 2013 *)
%Y A104838 Cf. A000796, A104819 - A104842.
%K A104838 nonn,base
%O A104838 1,1
%A A104838 _Zak Seidov_, Mar 27 2005