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 A082621 #15 Sep 20 2019 07:50:53 %S A082621 2,727,37273,3072703,307323703,30073237003,3006732376003, %T A082621 300067323760003,30000673237600003,3000067382837600003, %U A082621 300006738242837600003,30000673820402837600003,3000063738204028373600003,300006373821040128373600003,30000635738210401283753600003 %N A082621 a(1) = 2, then the smallest palindromic prime obtained by inserting digits anywhere in a(n-1) (including at the ends). %H A082621 Giovanni Resta, <a href="/A082621/b082621.txt">Table of n, a(n) for n = 1..51</a> %Y A082621 Cf. A002385, A082620, A082622, A082623, A082624. %K A082621 nonn,base %O A082621 1,1 %A A082621 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 29 2003 %E A082621 Corrected by _R. J. Mathar_, Oct 01 2006 %E A082621 More terms from _Giovanni Resta_, Sep 20 2019