|
|
A046098
|
|
Numbers n such that central binomial coefficient C(n, floor(n/2)) is squarefree.
|
|
19
|
|
|
0, 1, 2, 3, 4, 5, 7, 8, 11, 17, 19, 23, 71
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
|
|
LINKS
|
|
|
MATHEMATICA
|
Select[Range[0, 100], SquareFreeQ[Binomial[#, Floor[#/2]]]&] (* Harvey P. Dale, Mar 11 2011 *)
|
|
PROG
|
|
|
CROSSREFS
|
Cf. A056651 (cubefree central binomial coefficients).
|
|
KEYWORD
|
nonn,hard
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|