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 A089743 #4 Dec 05 2013 19:56:36 %S A089743 1,2,3,5,7,9,10,11,12,13,14,15,16,17,18,19,30,31,32,33,34,35,36,37,38, %T A089743 39,70,71,72,73,74,75,76,77,78,79,90,91,92,93,94,95,96,97,98,99,100, %U A089743 101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118 %N A089743 Numbers that are the leading digits of a palindromic prime. %C A089743 Conjecture: every number beginning with 1, 3, 7 or 9 begins infinitely many palindromic primes. %Y A089743 Cf. A082768, A089744. %K A089743 base,easy,nonn %O A089743 1,2 %A A089743 _Amarnath Murthy_, Nov 19 2003 %E A089743 Edited and extended by _David Wasserman_, Jul 28 2005