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 A104826 #17 Dec 14 2014 06:19:38
%S A104826 314159,358979,589793,462643,971693,169399,592307,348253,534211,
%T A104826 808651,844609,822317,725359,502841,102701,288109,612847,337867,
%U A104826 104543,815209,925409,917153,665213,951941
%N A104826 Primes from merging of 6 successive digits in decimal expansion of Pi.
%C A104826 Leading zeros are not permitted, so each term is 6 digits in length. - _Harvey P. Dale_, Oct 23 2011
%H A104826 Vincenzo Librandi, <a href="/A104826/b104826.txt">Table of n, a(n) for n = 1..1000</a>
%t A104826 With[{len=6},FromDigits/@Select[Partition[RealDigits[Pi,10,1000][[1]], len,1],PrimeQ[FromDigits[#]]&&IntegerLength[FromDigits[#]]==len&]] (* _Harvey P. Dale_, Oct 23 2011 *)
%Y A104826 Cf. A104819-A104842.
%K A104826 nonn,base
%O A104826 1,1
%A A104826 _Zak Seidov_, Mar 27 2005