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 A227647 #4 Jul 19 2013 06:04:23 %S A227647 8,9,16,27,32,36,49,64,81,100,121,125,128,144,196,256,484,729,900, %T A227647 1444,1728,2187,2209,2401,5184,5329,5776,5929,7225,7921,11664,15129, %U A227647 20164,41209,45369,46225,80656,121801,126025,201601,363609,443556,776161,806404 %N A227647 Perfect powers equal to the sum of 6 factorial numbers. %C A227647 a(51), if it exists, is larger than 10^100. %H A227647 Giovanni Resta, <a href="/A227647/b227647.txt">Table of n, a(n) for n = 1..50</a> (terms < 10^100) %H A227647 Giovanni Resta, <a href="/A227647/a227647.txt">Decompositions for a(1)-a(50)</a> %e A227647 443556 = 666^2 = 3! + 3! + 4! + 8! + 8! + 9!. %Y A227647 Cf. A114377, A227644-A227651. %K A227647 nonn %O A227647 1,1 %A A227647 _Giovanni Resta_, Jul 19 2013