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 A115697 #5 Mar 30 2012 17:40:35 %S A115697 4,8,9,27,36,72,81,121,243,324,400,484,648,800,900,1089,1331,1728, %T A115697 1800,2187,2197,2700,3267,3456,3600,4000,4356,4500,5184,5292,5324, %U A115697 5400,5625,6561,7200,7803,8000,8100,8712,9000,9261,9801,10201,11979 %N A115697 Powerful(1) numbers (A001694) whose digit reversal is the product of 2 palindromes greater than 1. %H A115697 <a href="/index/Pow#powerful">Index entries for sequences related to powerful numbers</a> %e A115697 3267=3^3*11^2 is powerful and 7623=77*99. %Y A115697 Cf. A001694, A115683. %K A115697 nonn,base %O A115697 1,1 %A A115697 _Giovanni Resta_, Jan 31 2006