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A043531 Number of distinct base-4 digits of n. 0
1, 1, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 3, 3, 2, 1, 2, 2, 3, 2, 2, 3, 3, 2, 3, 2, 2, 3, 2, 3, 3, 2, 2, 3, 2, 2, 1, 2, 3, 3, 2, 2, 2, 3, 3, 2, 3, 2, 3, 2, 3, 3, 2, 2, 2, 2, 2, 1, 2, 2, 3, 3, 2, 2, 3, 3, 3, 3, 3, 4, 3, 3, 4, 3, 2, 2, 3, 3, 2, 1, 2, 2, 3, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..90.

MATHEMATICA

Table[Length[Union[IntegerDigits[n, 4]]], {n, 100}] (* Harvey P. Dale, Aug 25 2016 *)

CROSSREFS

Cf. A007090.

Sequence in context: A275675 A219025 A270746 * A297772 A043556 A230643

Adjacent sequences:  A043528 A043529 A043530 * A043532 A043533 A043534

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 5 18:00 EDT 2021. Contains 346488 sequences. (Running on oeis4.)