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A284698
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Numbers k such that A284695(k) <= 3.
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1
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1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 27, 36, 48, 54, 64, 72, 81, 108, 144, 162, 192, 216, 256, 324, 432, 512, 576, 648, 729, 768, 1296, 1458, 1536, 1728, 2304, 2916, 4096, 4608, 5184, 5832, 6561, 6912, 11664, 12288, 13122, 13824, 19683, 20736, 26244, 36864
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OFFSET
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1,2
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COMMENTS
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This sequence is a subsequence of the 3-smooth numbers (A003586).
This sequence could be interpreted as the "recursive" 3-smooth numbers.
If i and j belong to this sequence, then 2^i, 3^j and 2^i*3^j also belong to this sequence.
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LINKS
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EXAMPLE
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1762613844998129336721604608 = 2^3^(2^2) * 3^(2*3) appears in this sequence.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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