A226828 Numbers of the form 4^j + 9^k, for j and k >= 0.

2, 5, 10, 13, 17, 25, 65, 73, 82, 85, 97, 145, 257, 265, 337, 730, 733, 745, 793, 985, 1025, 1033, 1105, 1753, 4097, 4105, 4177, 4825, 6562, 6565, 6577, 6625, 6817, 7585, 10657, 16385, 16393, 16465, 17113, 22945, 59050, 59053, 59065, 59113, 59305, 60073, 63145

Offset: 1

Author

T. D. Noe, Jun 19 2013

Keywords

• nonn

Links

• T. D. Noe, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A004050 (2^j + 3^k), A226806-A226832 (cases to 8^j + 9^k).

Programs

Mathematica

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]}]]]