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 A103404 #6 Aug 25 2012 09:44:44
%S A103404 2,191,94049,114232411,13649694631,1565887885651,175606737606571,
%T A103404 19508150605180591
%N A103404 The 10^n-th palindromic prime.
%e A103404 2, 3, 5, 7, 11, 101, 131, 151, 181 and 191 are the first ten palindromic primes.
%t A103404 NextPalindrome[n_] := Block[ {l = Floor[ Log[10, n] + 1], idn = IntegerDigits[n]}, If[ Union[ idn] == {9}, Return[n + 2], If[l < 2, Return[n + 1], If[ FromDigits[ Reverse[ Take[ idn, Ceiling[l/2]]]] FromDigits[ Take[ idn, -Ceiling[l/2]]], FromDigits[ Join[ Take[ idn, Ceiling[l/2]], Reverse[ Take[ idn, Floor[l/2]]] ]], idfhn = FromDigits[ Take[ idn, Ceiling[l/2]]] + 1; idp = FromDigits[ Join[ IntegerDigits[ idfhn], Drop[ Reverse[ IntegerDigits[ idfhn]], Mod[l, 2]]]] ]]]];
%t A103404 pal = 0; Do[pal = NextPalindrome[pal]; Do[While[pal = NextPalindrome[pal]; ! PrimeQ[pal], ], {i, 10^(n - 1) + 1, 10^n}]; Print[pal], {n, 0, 8}]
%Y A103404 Cf. A083816.
%K A103404 base,nonn
%O A103404 0,1
%A A103404 _Robert G. Wilson v_, Feb 03 2005
%E A103404 a(7) from _Donovan Johnson_, Aug 25 2012