A127573 Triangle T(n, k) = k*sigma(k) if k divides n, else 0.

1, 1, 6, 1, 0, 12, 1, 6, 0, 28, 1, 0, 0, 0, 30, 1, 6, 12, 0, 0, 72, 1, 0, 0, 0, 0, 0, 56, 1, 6, 0, 28, 0, 0, 0, 120, 1, 0, 12, 0, 0, 0, 0, 0, 117, 1, 6, 0, 0, 30, 0, 0, 0, 0, 180, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 132, 1, 6, 12, 28, 0, 72, 0, 0, 0, 0, 0, 336

Offset

1,3

Comments

Right border = n*sigma(n), A064987; row sums = A001001.

Links

Table of n, a(n) for n=1..78.

Example

First few rows of the triangle:
  1;
  1, 6;
  1, 0, 12;
  1, 6,  0, 28;
  1, 0,  0,  0, 30;
  ...

Crossrefs

Cf. A064987, A127093, A001001, A000203, A127574.

Sequence in context: A195402 A176402 A204013 * A351110 A137388 A302971

Adjacent sequences: A127570 A127571 A127572 * A127574 A127575 A127576

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 19 2007

Extensions

Corrected, extended and edited by Andrey Zabolotskiy, Sep 18 2022

Status

approved