|
| |
|
|
A127570
|
|
Triangle T(n,k) = sigma(k) if k|n, otherwise T(n,k)=0; 1<=k<=n.
|
|
0
| |
|
|
1, 1, 3, 1, 0, 4, 1, 3, 0, 7, 1, 0, 0, 0, 6, 1, 3, 4, 0, 0, 12, 1, 0, 0, 0, 0, 0, 8, 1, 3, 0, 7, 0, 0, 0, 15, 1, 0, 4, 0, 0, 0, 0, 0, 13, 1, 3, 0, 0, 6, 0, 0, 0, 0, 18, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 1, 3, 4, 7, 0, 12, 0, 0, 0, 0, 0, 28, 1
(list; table; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
FORMULA
| T(n,k) = sum_{j=k..n} A051731(n,j)*A130208(j,k) = A051731(n,k)*A000203(k).
|
|
|
EXAMPLE
| First few rows of the triangle are:
1;
1, 3;
1, 0, 4;
1, 3, 0, 7;
1, 0, 0, 0, 6;
1, 3, 4, 0, 0, 12;
...
|
|
|
CROSSREFS
| Cf. A000203 (sigma, diagonal n=k), A007429 (row sums), A051731.
Sequence in context: A159059 A127569 A117372 * A186827 A045406 A143468
Adjacent sequences: A127567 A127568 A127569 * A127571 A127572 A127573
|
|
|
KEYWORD
| nonn,tabl,easy
|
|
|
AUTHOR
| Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 19 2007
|
| |
|
|
