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 A227648 #4 Jul 19 2013 06:04:29 %S A227648 8,9,16,25,27,32,36,64,81,100,128,144,169,196,256,324,484,512,529,625, %T A227648 729,784,841,1089,1225,2187,2197,2916,3025,3721,5184,5776,6241,6724, %U A227648 10816,15129,15876,20164,25921,40401,40804,42025,45369,47524,51984,57600,80656 %N A227648 Perfect powers equal to the sum of 7 factorial numbers. %C A227648 a(80), if it exists, is larger than 10^100. %H A227648 Giovanni Resta, <a href="/A227648/b227648.txt">Table of n, a(n) for n = 1..79</a> (terms < 10^100) %H A227648 Giovanni Resta, <a href="/A227648/a227648.txt">Decompositions for a(1)-a(79)</a> %e A227648 83521 = 17^4 = 1! + 6! + 6! + 6! + 6! + 8! + 8!. %Y A227648 Cf. A114377, A227644-A227651. %K A227648 nonn %O A227648 1,1 %A A227648 _Giovanni Resta_, Jul 19 2013