|
Search: id:A020475
|
|
|
| A020475 |
|
a(n) is number of k for which C(n,k) is divisible by n. |
|
+0
8
|
|
| 0, 2, 1, 2, 2, 4, 2, 6, 4, 6, 6, 10, 5, 12, 6, 8, 8, 16, 10, 18, 10, 14, 14, 22, 10, 20, 18, 18, 14, 28, 11, 30, 16, 26, 30, 26, 22, 36, 30, 30, 22, 40, 20, 42, 26, 26, 30, 46, 20, 42, 34, 32, 34, 52, 26, 46, 33, 50, 42, 58, 26, 60, 30, 46, 32, 50, 48, 66, 58, 50, 44, 70, 40, 72, 66, 46, 58
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Note that n is prime iff a(n)=n-1. - T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
|
|
LINKS
|
T. D. Noe, Table of n, a(n) for n = 0..1000
|
|
FORMULA
|
a(n)=n+1-A007012(n) - T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
|
|
MATHEMATICA
|
Table[cnt=0; Do[If[Mod[Binomial[n, k], n]==0, cnt++ ], {k, 0, n}]; cnt, {n, 0, 100}] - T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
|
|
CROSSREFS
|
Adjacent sequences: A020472 A020473 A020474 this_sequence A020476 A020477 A020478
Sequence in context: A139318 A054541 A102722 this_sequence A131183 A133770 A163373
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
David W. Wilson (davidwwilson(AT)comcast.net)
|
|
EXTENSIONS
|
More terms from T. D. Noe (noe(AT)sspectra.com), Feb 23 2006
|
|
|
Search completed in 0.002 seconds
|
