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 A262640 #4 Oct 26 2015 22:24:07
%S A262640 3,29,373,104281,26834329,912643687,1226640300497,98267311812235733,
%T A262640 1020860032010008425847,21115310556546915420698449,
%U A262640 1012916271690222867857136967,26879969170345514485602194376469,19901192726231131838758996344598879
%N A262640 Base-10 representation of the primes at A262639.
%H A262640 Clark Kimberling, <a href="/A262640/b262640.txt">Table of n, a(n) for n = 1..300</a>
%e A262640 n A262639(n) base-10 representation
%e A262640 1 3 3
%e A262640 2 131 29
%e A262640 3 11311 373
%t A262640 s = {3}; base = 4; z = 20; Do[NestWhile[# + 1 &, 1, ! PrimeQ[tmp = FromDigits[Join[#, IntegerDigits[Last[s]], Reverse[#]] &[IntegerDigits[#, base]], base]] &];
%t A262640 AppendTo[s, FromDigits[IntegerDigits[tmp, base]]], {z}]; s (* A262639 *)
%t A262640 Map[FromDigits[ToString[#], base] &, s] (* A262640 *)
%t A262640 (* _Peter J. C. Moses_, Sep 01 2015 *)
%Y A262640 Cf. A262639.
%K A262640 nonn,easy,base
%O A262640 1,1
%A A262640 _Clark Kimberling_, Oct 24 2015