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 A138667 #2 Mar 30 2012 18:35:47
%S A138667 64,94,160,256,268,301,333,390,682,864,1015,1151,1188,2068,3094,4165,
%T A138667 4177,5452,5959,6201,6490,8181,9334,11440,11561,11628,14116,14416,
%U A138667 17220,18684,18940,19360,20856,21825,25880,26865,27501,28630,28850,28858
%N A138667 Values of x 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.
%C A138667 A045991(x)=A045991(z)-A045991(y), y=A138668(n) and z=A138669(n).
%e A138667 Solutions to the Diophantine equation in lexicographic order: {x, y, z}: {64, 100, 108}, {94, 301, 304}, {160, 226, 250}, {256, 305, 356}, {268, 341, 389}, {301, 770, 785}, {333, 370, 444}, {390, 876, 901},...
%Y A138667 Cf. A138668, A138669, A045991.
%K A138667 nonn
%O A138667 1,1
%A A138667 _Manuel Valdivia_, Apr 17 2008