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A043531 Number of distinct base-4 digits of n. 0

%I #11 Apr 24 2021 21:26:22

%S 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,

%T 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,

%U 2,3,3,3,3,3,4,3,3,4,3,2,2,3,3,2,1,2,2,3,2,2

%N Number of distinct base-4 digits of n.

%t Table[Length[Union[IntegerDigits[n,4]]],{n,100}] (* _Harvey P. Dale_, Aug 25 2016 *)

%Y Cf. A007090.

%K nonn,base

%O 1,4

%A _Clark Kimberling_

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Last modified April 25 10:34 EDT 2024. Contains 371967 sequences. (Running on oeis4.)