A179932 Number of distinct positive integers that can be formed with the decimal digits of n.

1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 2, 4, 4, 2, 4, 4, 4, 4, 4, 4, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 4, 4, 4, 2, 4, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 4, 2, 4, 4, 2, 4, 4, 4, 4, 4, 4, 4, 2, 4, 2, 4, 4, 4, 4, 4, 4, 4, 4, 2, 3, 5, 10, 10

Offset: 1

Author

Dominick Cancilla, Aug 02 2010

Keywords

• nonn
• base

Examples

			a(1) = 1 because there is only one number that can be formed with the digits in 1.
a(10) = 2 because the digits in 10 can be used to make 0, 1, 01, and 10, but only 1 and 10 are both nonzero and unique (obviously, 01=1).
		

Programs

Mathematica

Table[Length[Union[FromDigits/@Flatten[Permutations/@Flatten[ Table[ Partition[ IntegerDigits[t],n,1],{n,IntegerLength[t]}],1],1]/.(0-> Nothing)]], {t,110}] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Sep 21 2016 *)