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 A104839 #10 Aug 25 2013 06:04:29
%S A104839 3832795028841971693,9716939937510582097,348253421170679821,
%T A104839 4461284756482337867,8233786783165271201,3486104543266482133,
%U A104839 917153643678925903,3643678925903600113,9218611738193261179
%N A104839 Primes from merging of 19 successive digits in decimal expansion of Pi.
%H A104839 Vincenzo Librandi, <a href="/A104839/b104839.txt">Table of n, a(n) for n = 1..1000</a>
%t A104839 With[{pi = FromDigits/@Partition[RealDigits[Pi, 10, 900][[1]], 19, 1]}, Select[pi, PrimeQ]] (* _Vincenzo Librandi_, Apr 21 2013 *)
%Y A104839 Cf. A000796, A104819 - A104842.
%K A104839 nonn,base
%O A104839 1,1
%A A104839 _Zak Seidov_, Mar 27 2005