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 A236249 #14 Jan 21 2014 07:57:21
%S A236249 3,241,911,184727,30067266499540931,
%T A236249 1454272161238683681127450712107767894181359647011258114106151524833563647084221
%N A236249 Primes of the form C(2*m, m) - prime(m), where C(2*m, m) = (2*m)!/(m!)^2.
%C A236249 Though the primes in this sequence are very rare, according to the conjecture in A236256 there should be infinitely many such primes.
%C A236249 See A236248 for a list of known numbers m with C(2*m, m) - prime(m) prime.
%C A236249 See also A236245 for a similar sequence.
%H A236249 Zhi-Wei Sun, <a href="/A236249/b236249.txt">Table of n, a(n) for n = 1..12</a>
%e A236249 a(1) = 3 since C(2*1, 1) - prime(1) = 0 is not prime, but C(2*2, 2) - prime(2) = 6 - 3 = 3 is prime.
%t A236249 t[n_]:=Binomial[2n,n]-Prime[n]
%t A236249 a[n_]:=t[A234248(n)]
%t A236249 Table[a[n],{n,1,6}]
%Y A236249 Cf. A000040, A000984, A236241, A236242, A236245, A236248, A236256.
%K A236249 nonn
%O A236249 1,1
%A A236249 _Zhi-Wei Sun_, Jan 21 2014