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 A032735 #13 Jun 25 2020 01:59:00 %S A032735 11111,60806,65356,1115111,1392931,1643461,1762671,1797971,1799971, %T A032735 1863681,1911191,2005002,2190912,2429242,2499942,2512152,2708072, %U A032735 2714172,2794972,2845482,2848482,2942492,2993992,3150513,3239323 %N A032735 Palindromes that cannot be prefixed and followed by any digit to form a prime. %H A032735 Chai Wah Wu, <a href="/A032735/b032735.txt">Table of n, a(n) for n = 1..10000</a> %e A032735 11111 prefixed and followed with a digit from (1,2,3,4,5,6,7,8,9) never yields a prime: '2'11111'3' = 29 x 72797. %Y A032735 Cf. A032682-A032685 and A032702-A032733. %K A032735 nonn,base %O A032735 1,1 %A A032735 _Patrick De Geest_, May 15 1998