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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
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
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)