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 A138669 #5 Mar 30 2012 18:35:47 %S A138669 108,304,250,356,389,785,444,901,1298,1864,3480,2159,6828,3029,6149, %T A138669 5439,44994,67094,9259,13305,20934,23895,16854,18660,23936,19653, %U A138669 32034,28996,31940,54974,97259,28164,26742,27984,37958,62880,88704,610326 %N A138669 Values of z in solutions (x,y,z) to the Diophantine equation x^3-x^2+y^3-y^2=z^3-z^2, with 1<x<y<z arranged in order of increasing x. %C A138669 A045991(z)=A045991(x)+A045991(y), y=A138668(n) and x=A138667(n). %Y A138669 Cf. A138667, A138668, A045991. %K A138669 nonn %O A138669 1,1 %A A138669 _Manuel Valdivia_, Apr 17 2008