A127574 -id:A127574 - cp's OEIS frontend

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

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Gary W. Adamson, Jan 19 2007

nonn
tabl

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

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

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

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

cp's OEIS Frontend

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

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