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A084790 Increasing gaps between 3-smooth numbers (upper end). 5
2, 6, 12, 16, 24, 48, 96, 128, 192, 288, 324, 384, 576, 648, 729, 864, 972, 1152, 1296, 1458, 1728, 1944, 2592, 2916, 3456, 3888, 5184, 5832, 7776, 10368, 11664, 15552, 23328, 31104, 46656, 93312, 177147, 209952, 236196, 279936, 314928 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A084788(n) + A084789(n).

a(n) = A003586(A084791(n) + 1).

MATHEMATICA

s = {}; m = 13; Do[n = 3^k; While[n <= 3^m, AppendTo[s, n]; n*=2], {k, 0, m}]; s = Union[s]; d = Differences @ s; v = DeleteDuplicates @ FoldList[Max, d]; Map[s[[1 + First@ Position[d, #]]] &, v] //Flatten (* Amiram Eldar, Jan 30 2020 *)

CROSSREFS

Cf. A003586, A061987, A084788, A084789, A084791.

Sequence in context: A143408 A191331 A088915 * A130237 A053457 A299112

Adjacent sequences:  A084787 A084788 A084789 * A084791 A084792 A084793

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jun 03 2003

STATUS

approved

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Last modified June 2 06:13 EDT 2020. Contains 334767 sequences. (Running on oeis4.)