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%I #3 Jun 19 2013 02:25:14
%S 2,5,6,9,17,21,26,29,41,65,69,89,126,129,141,189,257,261,281,381,626,
%T 629,641,689,881,1025,1029,1049,1149,1649,3126,3129,3141,3189,3381,
%U 4097,4101,4121,4149,4221,4721,7221,15626,15629,15641,15689,15881,16385,16389
%N Numbers of the form 4^j + 5^k, for j and k >= 0.
%H T. D. Noe, <a href="/A226810/b226810.txt">Table of n, a(n) for n = 1..10000</a>
%t a = 4; b = 5; mx = 20000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]
%Y Cf. A004050 (2^j + 3^k), A226806-A226832 (cases to 8^j + 9^k).
%K nonn
%O 1,1
%A _T. D. Noe_, Jun 19 2013
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