A127573 - OEIS

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A127573

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

1

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

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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