|
|
A180409
|
|
Unique digits used in n in numerical order (with 0 last)
|
|
1
|
|
|
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
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
FORMULA
|
a(n) = 1234567890 after any digits not appearing in n are removed
|
|
EXAMPLE
|
a(93077) = 3790. Seven is only used once and the digits are sorted with zero last
|
|
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 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn,base
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|