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A226815
Numbers of the form 2^j + 7^k, for j and k >= 0.
1
2, 3, 5, 8, 9, 11, 15, 17, 23, 33, 39, 50, 51, 53, 57, 65, 71, 81, 113, 129, 135, 177, 257, 263, 305, 344, 345, 347, 351, 359, 375, 407, 471, 513, 519, 561, 599, 855, 1025, 1031, 1073, 1367, 2049, 2055, 2097, 2391, 2402, 2403, 2405, 2409, 2417, 2433, 2465
OFFSET
1,1
MATHEMATICA
a = 2; b = 7; mx = 3000; 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: A119863 A285253 A047254 * A284890 A051214 A256722
KEYWORD
nonn
AUTHOR
T. D. Noe, Jun 19 2013
STATUS
approved