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 A257671 #11 May 07 2015 11:04:09
%S A257671 2,3,4,5,6,7,8,9,11,12,13,17,18,19,20,22,24,29,30,31,35,46,47,48,49,
%T A257671 51,53,58,64,76,77,78,82,93,122,123,124,125,127,129,134,140,152,169,
%U A257671 199,200,201,205,216,245,321,322,323,324,326,328,333,339,351,368
%N A257671 Numbers of the form floor(r^i + s^j), where r = (1 + sqrt(5))/2, s = r^2, i >= 0, j >= 0.
%t A257671 mx = 400; r = GoldenRatio; s = r/(r - 1); Union@ Flatten@ Table[ Floor[r^i + s^j], {i, Log[r, mx]}, {j, 0, Log[s, mx - r^i]}] (* iterators modified by _Robert G. Wilson v_, May 07 2015 *)
%Y A257671 Cf. A001622, A104457.
%Y A257671 Cf. A257672.
%K A257671 nonn,easy
%O A257671 1,1
%A A257671 _Clark Kimberling_, May 03 2015