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 A115686 #5 Mar 30 2012 17:40:35 %S A115686 16,32,125,128,196,200,361,392,500,784,1024,1352,1369,1372,1444,1600, %T A115686 1681,2000,3200,3844,5000,7225,7688,7921,9025,9248,9409,9800,10976, %U A115686 11236,12500,12800,13448,14161,14792,16000,18496,19321,19600,20000 %N A115686 Powerful(1) numbers (A001694) whose digit reversal is a prime number. %H A115686 <a href="/index/Pow#powerful">Index entries for sequences related to powerful numbers</a> %e A115686 7688=2^3*31^2 is powerful and 8867 is prime. %Y A115686 Cf. A001694. %K A115686 nonn,base %O A115686 1,1 %A A115686 _Giovanni Resta_, Jan 31 2006