A043537 - OEIS

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A043537

Number of distinct base-10 digits of n.

58

1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

COMMENTS

a(A000079(A130694(n))) = 10. - Reinhard Zumkeller, Jul 29 2007

a(A000290(A016070(n))) = 2. - Reinhard Zumkeller, Aug 05 2010

a(n) = 10 for almost all n. - Charles R Greathouse IV, Oct 02 2013

LINKS

R. Zumkeller, Table of n, a(n) for n = 1..10000

MAPLE

A043537 := proc(n)

convert(convert(n, base, 10), set) ;

nops(%) ;

end proc: # R. J. Mathar, Dec 22 2012

MATHEMATICA

Count[DigitCount@ #, n_ /; n > 0] & /@ Range@ 120 (* Michael De Vlieger, Aug 29 2015 *)

PROG

(Haskell)

import Data.List (nub)

a043537 = length . nub . show -- Reinhard Zumkeller, Apr 16 2011

(PARI) a(n)=#vecsort(digits(n), , 8) \\ Charles R Greathouse IV, Oct 02 2013

(Python)

def A043537(n): return len(set(str(n))) # Dimiter Skordev, Oct 02 2021

CROSSREFS

Cf. A047726, A118668, A119797, A119798, A119799, A119823, A038378, A076493, A055642, A178788.

Sequence in context: A043561 A297778 A043562 * A047726 A297779 A043563

Adjacent sequences: A043534 A043535 A043536 * A043538 A043539 A043540

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling

STATUS

approved