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A043539 Number of distinct base 12 digits of n. 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,12

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..5000

FORMULA

From Michael De Vlieger, Aug 14 2017: (Start)

a(11) = 1 since 11 in base 12 is written with a single digit.

a(13) = 1 since 13 in base 12 is written "11".

a(14) = 2 since 14 in base 12 is written "12".

a(146) is the first appearance of 3 in this sequence, since it is written "102" in base 12.

(End)

MATHEMATICA

Table[Length[Select[DigitCount[n, 12], #>0&]], {n, 100}] (* Vincenzo Librandi, Aug 13 2017 *)

PROG

(PARI) a(n) = #Set(digits(n, 12)); \\ Michel Marcus, Aug 13 2017

CROSSREFS

Sequence in context: A043538 A297780 A043564 * A297781 A043565 A043540

Adjacent sequences:  A043536 A043537 A043538 * A043540 A043541 A043542

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified March 19 13:08 EDT 2019. Contains 321330 sequences. (Running on oeis4.)