A060417 Number of different decimal digits in n-th prime.

1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 2, 3, 2, 3, 3, 3, 2, 3, 3, 3, 3, 3, 2, 2, 3, 3, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 2, 2, 3, 2, 2, 3, 3, 2, 3, 3, 2, 3, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 2, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 3, 3, 3, 3, 3, 2, 3, 3, 3

Offset

1,6

Links

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

Formula

Table[Length[Union[IntegerDigits[Prime[w]]]], {w, 1, 1000}]

Example

The maximum is 10. Thus 1234567891 is a prime with 9 and 123456789011 with 10 different decimal digits.

Prog

(Haskell)
import Data.List (nub, sort)
a060417 = length . nub . show . a000040
-- Reinhard Zumkeller, Apr 08 2012

Crossrefs

Cf. A055642, A097944.

Sequence in context: A077429 A204553 A214455 * A097944 A037203 A032556

Adjacent sequences: A060414 A060415 A060416 * A060418 A060419 A060420

Keyword

base,easy,nonn

Author

Labos Elemer, Apr 05 2001

Status

approved