|
Search: id:A106845
|
|
|
| A106845 |
|
n^2 * (n^3 + 2n^2 + 7n - 2) / 8. |
|
+0
1
|
|
| 0, 1, 14, 72, 244, 650, 1476, 2989, 5552, 9639, 15850, 24926, 37764, 55432, 79184, 110475, 150976, 202589, 267462, 348004, 446900, 567126, 711964, 885017, 1090224, 1331875, 1614626, 1943514, 2323972, 2761844, 3263400, 3835351, 4484864
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
COMMENT
|
a(n) = Sum {1<=k,l,m<=n; k+l+m divisible by n} klm.
|
|
PROGRAM
|
(PARI) a(n)=if(n<1, 0, sum(k=1, n, sum(l=1, n, sum(m=1, n, if((k+l+m)%n==0, k*l*m))))) /* Michael Somos May 16 2005 */
|
|
CROSSREFS
|
Adjacent sequences: A106842 A106843 A106844 this_sequence A106846 A106847 A106848
Sequence in context: A034562 A041372 A074086 this_sequence A108650 A093567 A010821
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Ralf Stephan, May 06 2005
|
|
|
Search completed in 0.002 seconds
|
