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A226827 Numbers of the form 3^j + 9^k, for j and k >= 0. 2
2, 4, 10, 12, 18, 28, 36, 82, 84, 90, 108, 162, 244, 252, 324, 730, 732, 738, 756, 810, 972, 1458, 2188, 2196, 2268, 2916, 6562, 6564, 6570, 6588, 6642, 6804, 7290, 8748, 13122, 19684, 19692, 19764, 20412, 26244, 59050, 59052, 59058, 59076, 59130, 59292, 59778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If every number 3^j + 9^k is considered, then there are duplicates of 10, 82, 90, 730, 738, 810, 6562, 6570, 6642, 7290, 59050, 59058, 59130, 59778, 65610,....

LINKS

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

MATHEMATICA

a = 3; b = 9; mx = 60000; 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).

Cf. A226793 ((3^j + 9^k)/2).

Sequence in context: A107059 A160716 A071642 * A266538 A265223 A034166

Adjacent sequences:  A226824 A226825 A226826 * A226828 A226829 A226830

KEYWORD

nonn

AUTHOR

T. D. Noe, Jun 19 2013

STATUS

approved

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Last modified January 20 06:47 EST 2019. Contains 319325 sequences. (Running on oeis4.)