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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
OFFSET
1,3
COMMENTS
Right border = n*sigma(n), A064987; row sums = A001001.
EXAMPLE
First few rows of the triangle:
1;
1, 6;
1, 0, 12;
1, 6, 0, 28;
1, 0, 0, 0, 30;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jan 19 2007
EXTENSIONS
Corrected, extended and edited by Andrey Zabolotskiy, Sep 18 2022
STATUS
approved