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 A115681 #2 Mar 30 2012 17:40:35 %S A115681 4,6,9,21,121,253,407,451,559,583,667,671,803,869,2173,2537,5063,5183, %T A115681 5893,10201,13231,15251,16171,18281,19291,22523,22733,24743,25283, %U A115681 26563,27383,28583,28783,31613,35653,37673,38683,40567,45349,46217 %N A115681 Brilliant numbers (A078972) whose digit reversal is the product of 2 palindromes greater than 1. %e A115681 22523=101*223 is brilliant and 32522=2*16261. %Y A115681 Cf. A078972, A115683. %K A115681 nonn,base %O A115681 1,1 %A A115681 _Giovanni Resta_, Jan 31 2006