|
Search: id:A060763
|
|
|
| A060763 |
|
Number of distinct differences between consecutive divisors (ordered by increasing magnitude) of n which are not also divisors of n. |
|
+0
8
|
|
| 0, 0, 1, 0, 1, 0, 1, 0, 2, 1, 1, 0, 1, 1, 2, 0, 1, 0, 1, 0, 3, 1, 1, 0, 2, 1, 3, 1, 1, 1, 1, 0, 3, 1, 3, 0, 1, 1, 3, 1, 1, 0, 1, 1, 4, 1, 1, 0, 2, 2, 3, 1, 1, 0, 3, 2, 3, 1, 1, 0, 1, 1, 4, 0, 3, 1, 1, 1, 3, 3, 1, 0, 1, 1, 3, 1, 3, 1, 1, 2, 4, 1, 1, 1, 3, 1, 3, 1, 1, 1, 2, 1, 3, 1, 3, 0, 1, 2, 4, 0, 1, 1, 1, 1, 5
(list; graph; listen)
|
|
|
OFFSET
|
1,9
|
|
|
EXAMPLE
|
For n=70, divisors={1,2,5,7,10,14,35,70}; differences={1,3,2,3,4,21,35}; the differences {3,4,21} are not divisors, so a(70)=3.
|
|
MATHEMATICA
|
a[n_] := Length[Complement[Drop[d=Divisors[n], 1]-Drop[d, -1], d]]
|
|
CROSSREFS
|
Cf. A060682, A060738, A060764.
Sequence in context: A104234 A037870 A026920 this_sequence A131576 A100073 A075685
Adjacent sequences: A060760 A060761 A060762 this_sequence A060764 A060765 A060766
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), Apr 24 2001
|
|
EXTENSIONS
|
Edited by Dean Hickerson (dean(AT)math.ucdavis.edu), Jan 22 2002
|
|
|
Search completed in 0.002 seconds
|
