A045841 Number of distinct odd numbers formed from the digits of n.

0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 2, 2, 4, 2, 4, 2, 4, 2, 4, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 4, 2, 2, 2, 4, 2, 4, 2, 4, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 4, 2, 4, 2, 2, 2, 4, 2, 4, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 4, 2, 4, 2, 4, 2, 2, 2, 4, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 4, 2, 4, 2, 4, 2, 4, 2, 2

Offset

0,12

Links

Table of n, a(n) for n=0..99.

Example

a(37)=4 because we can form 3, 7, 37 and 73.

Mathematica

f[n_]:=Length[Select[FromDigits/@Flatten[Rest[Permutations/@Subsets[IntegerDigits[n]]], 1], OddQ]]; Table[f[i], {i, 0, 100}]  (* Harvey P. Dale, Jan 29 2011 *)

Crossrefs

Sequence in context: A102641 A054763 A100374 * A040003 A106469 A082508

Adjacent sequences: A045838 A045839 A045840 * A045842 A045843 A045844

Keyword

nonn,base,easy

Author

Felice Russo

Extensions

More terms from Erich Friedman

Status

approved