A180409 Unique digits used in n in numerical order (with 0 last).

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 12, 13, 14, 15, 16, 17, 18, 19, 20, 12, 2, 23, 24, 25, 26, 27, 28, 29, 30, 13, 23, 3, 34, 35, 36, 37, 38, 39, 40, 14, 24, 34, 4, 45, 46, 47, 48, 49, 50, 15, 25, 35, 45, 5, 56, 57, 58, 59, 60, 16, 26, 36, 46, 56, 6

Offset: 1

Author

Dominick Cancilla, Sep 02 2010

Keywords

• easy
• nonn
• base

Examples

			a(93077) = 3790. Seven is only used once and the digits are sorted with zero last
		

Programs

Mathematica

udno[n_]:=Module[{c=Union[IntegerDigits[n]]},FromDigits[If[First[c] == 0, RotateLeft[ c],c]]]; Array[udno,70] (* Harvey P. Dale, Dec 23 2015 *)

Formula

a(n) = 1234567890 after any digits not appearing in n are removed