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 A226794 #3 Jun 19 2013 13:25:40
%S A226794 1,3,5,7,13,17,41,43,53,63,67,103,313,317,353,365,367,377,427,677,
%T A226794 1563,1567,1603,1927,3281,3283,3293,3343,3593,4843,7813,7817,7853,
%U A226794 8177,11093,29525,29527,29537,29587,29837,31087,37337,39063,39067,39103
%N A226794 Numbers of the form (5^j + 9^k)/2, for j and k >= 0.
%t A226794 a = 5; b = 9; mx = 80000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]/2
%Y A226794 Cf. A226829 (5^j + 9^k).
%K A226794 nonn
%O A226794 1,2
%A A226794 _T. D. Noe_, Jun 19 2013