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

Author

Labos Elemer, Apr 05 2001

Keywords

• base
• easy
• nonn

Examples

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

Links

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

Crossrefs

Cf. A055642, A097944.

Programs

Haskell

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

Formula

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