A226817 Numbers of the form 4^j + 7^k, for j and k >= 0.

2, 5, 8, 11, 17, 23, 50, 53, 65, 71, 113, 257, 263, 305, 344, 347, 359, 407, 599, 1025, 1031, 1073, 1367, 2402, 2405, 2417, 2465, 2657, 3425, 4097, 4103, 4145, 4439, 6497, 16385, 16391, 16433, 16727, 16808, 16811, 16823, 16871, 17063, 17831, 18785, 20903

Offset

1,1

Links

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

Mathematica

a = 4; b = 7; mx = 30000; Union[Flatten[Table[a^n + b^m, {m, 0, Log[b, mx]}, {n, 0, Log[a, mx - b^m]}]]]

Crossrefs

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

Sequence in context: A365808 A344719 A192147 * A154484 A129300 A347839

Adjacent sequences: A226814 A226815 A226816 * A226818 A226819 A226820

Keyword

nonn

Author

T. D. Noe, Jun 19 2013

Status

approved