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 A043530 Number of distinct base-3 digits of n. 4
 1, 1, 2, 1, 2, 2, 2, 1, 2, 2, 3, 2, 1, 2, 3, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 1, 2, 2, 3, 2, 2, 3, 3, 3, 3, 2, 2, 3, 2, 1, 2, 3, 2, 2, 3, 3, 3, 3, 2, 2, 3, 2, 2, 2, 3, 2, 3, 3, 3, 2, 3, 2, 3, 3, 3, 3, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 1, 2, 2, 3, 2, 2, 3, 3, 3, 3, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS a(A031944(n)) = 3; a(A154314(n)) < 3. - Reinhard Zumkeller, Jan 07 2009 Image, under the coding sending i -> 1+floor(i/3), of the fixed point, starting with 0, of the morphism 0 -> 012, 1 -> 314, 2 -> 542, 3 -> 336, 4 -> 644, 5 -> 565, 6 -> 666. - Jeffrey Shallit, May 15 2016 LINKS Antti Karttunen, Table of n, a(n) for n = 1..19683 MATHEMATICA Table[Length[Union[IntegerDigits[n, 3]]], {n, 90}] (* Harvey P. Dale, May 13 2020 *) PROG (PARI) a(n) = #vecsort(digits(n, 3), , 8); \\ Michel Marcus, May 16 2016 CROSSREFS Cf. A007089, A031944, A037897, A154314. Sequence in context: A103318 A197775 A002321 * A297771 A164995 A294108 Adjacent sequences:  A043527 A043528 A043529 * A043531 A043532 A043533 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified August 5 15:11 EDT 2021. Contains 346471 sequences. (Running on oeis4.)