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 A173868 #2 Mar 31 2012 12:38:28
%S A173868 2,3,7,17,43,137,431,1433,4871,16811,58787,208037,742909,2674453,
%T A173868 9694849,35357711,129644831,477638741,1767263209,6564120463,
%U A173868 24466267027,91482563651,343059613667,1289904147349,4861946401453,18367353072191
%N A173868 Smallest primes > Catalan numbers.
%t A173868 PrimeNext[n_]:=Module[{k=n+1},While[ !PrimeQ[k],k++ ];k]; f[n_]:=(2n)!/n!/(n+1)!; Table[PrimeNext[f[n]],{n,40}]
%Y A173868 Cf. A000108, A173867
%K A173868 nonn
%O A173868 1,1
%A A173868 _Vladimir Joseph Stephan Orlovsky_, Feb 28 2010