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 A104320 Number of zeros in ternary representation of 2^n. 6
 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 1, 1, 1, 4, 1, 0, 4, 2, 3, 3, 3, 3, 3, 7, 7, 9, 5, 6, 6, 4, 4, 3, 5, 6, 7, 9, 9, 10, 6, 6, 9, 9, 8, 9, 8, 7, 13, 12, 13, 9, 5, 9, 8, 6, 16, 13, 9, 10, 11, 11, 7, 14, 13, 13, 9, 12, 14, 15, 15, 11, 11, 17, 15, 19, 14, 19, 12, 18, 15, 11, 10, 16, 15, 14, 14, 13, 17, 14 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,9 COMMENTS a(n) = A077267(A000079(n)); a(A104321(n))=n and a(m)<>n for m < A104321(n); N. J. A. Sloane conjectures a(n)>0 for n>15, see A102483. LINKS EXAMPLE n=13: 2^13=8192 -> '102020102', a(13) = 4. MATHEMATICA Table[DigitCount[2^n, 3, 0], {n, 0, 90}] (* Harvey P. Dale, May 06 2014 *) CROSSREFS Cf. A004642, A007089. Sequence in context: A140751 A259922 A162741 * A242618 A180264 A225200 Adjacent sequences:  A104317 A104318 A104319 * A104321 A104322 A104323 KEYWORD nonn AUTHOR Reinhard Zumkeller, Mar 01 2005 STATUS approved

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Last modified October 21 08:47 EDT 2019. Contains 328292 sequences. (Running on oeis4.)