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 A109864 #4 Dec 05 2013 19:57:00 %S A109864 11,2,3,0,5,0,7,0,919,101,11,12421,131,14341,151,16061,17471,181,191, %T A109864 0,0,0,0,0,0,0,0,0,0,30103,313,32323,33533,34543,353,36263,373,383, %U A109864 39293,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A109864 Least palindromic prime beginning with n, or 0 if no such prime exists. %C A109864 Conjecture: a(n) = 0 if and only if n > 3 and n begins with 2,4,6,8 or 5 (most significant digit). %K A109864 base,nonn %O A109864 1,1 %A A109864 _Amarnath Murthy_, Jul 08 2005 %E A109864 Corrected and extended by _Giovanni Resta_, Feb 07 2006