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 A226828 #3 Jun 19 2013 02:28:29
%S A226828 2,5,10,13,17,25,65,73,82,85,97,145,257,265,337,730,733,745,793,985,
%T A226828 1025,1033,1105,1753,4097,4105,4177,4825,6562,6565,6577,6625,6817,
%U A226828 7585,10657,16385,16393,16465,17113,22945,59050,59053,59065,59113,59305,60073,63145
%N A226828 Numbers of the form 4^j + 9^k, for j and k >= 0.
%H A226828 T. D. Noe, <a href="/A226828/b226828.txt">Table of n, a(n) for n = 1..10000</a>
%t A226828 a = 4; b = 9; mx = 70000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]
%Y A226828 Cf. A004050 (2^j + 3^k), A226806-A226832 (cases to 8^j + 9^k).
%K A226828 nonn
%O A226828 1,1
%A A226828 _T. D. Noe_, Jun 19 2013