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 A052205 #18 Oct 22 2023 21:58:04 %S A052205 2,1022201,1051022201501,1241051022201501421, %T A052205 1071241051022201501421701,1051071241051022201501421701501, %U A052205 1091051071241051022201501421701501901,1351091051071241051022201501421701501901531 %N A052205 a(n+1) is smallest palindromic prime containing exactly 3 more digits on each end than the previous term, with a(n) as a central substring. %H A052205 Giovanni Resta, <a href="/A052205/b052205.txt">Table of n, a(n) for n = 1..26</a> (full sequence) %Y A052205 Cf. A047076, A053600, A034276, A256957, A052091, A052092. %K A052205 base,nonn,fini,full %O A052205 1,1 %A A052205 _G. L. Honaker, Jr._, Jan 28 2000 %E A052205 Shown to be finite by _Felice Russo_