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 A124360 #3 Aug 24 2012 10:49:57 %S A124360 1,9,28,36,54,90,108,135,154,181,207,225,234,307,360,388,469,523,540, %T A124360 685,720 %N A124360 Numbers n for which the sum of the digits of n^k and the sum of the digits of n^(k+1), for some k, is equal to n. %e A124360 18^6=34012224 (3+4+0+1+2+2+2+4=18) and 18^7=612220032 (6+1+2+2+2+0+0+3+2=18) %e A124360 Again 36^4=1679616 (1+6+7+9+6+1+6=36) and 36^5=60466176 (6+0+4+6+6+1+7+6=36) %Y A124360 Cf. A124359. %K A124360 nonn,base %O A124360 0,2 %A A124360 _Paolo P. Lava_ and _Giorgio Balzarotti_, Oct 27 2006