

A127572


Triangle, T(n,k) = sigma(k) * n/k if kn, T(n,k) = 0 otherwise.


0



1, 2, 3, 3, 0, 4, 4, 6, 0, 7, 5, 0, 0, 0, 6, 6, 9, 8, 0, 0, 12, 7, 0, 0, 0, 0, 0, 8, 8, 12, 0, 14, 0, 0, 0, 15, 9, 0, 12, 0, 0, 0, 0, 0, 13, 10, 15, 0, 0, 12, 0, 0, 0, 0, 18
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


LINKS

Table of n, a(n) for n=1..55.


FORMULA

A126988 * M, where M = an infinite matrix with sigma(n) in the main diagonal and the rest zeros.


EXAMPLE

First few rows of the triangle are:
1;
2, 3;
3, 0, 4;
4, 6, 0, 7;
5, 0, 0, 0, 6;
6, 9, 8, 0, 0, 12;
...


CROSSREFS

Main diagonal = sigma(n), A000203; row sums = A060640.
Cf. A126988.
Sequence in context: A026932 A087401 A192498 * A021815 A238525 A075255
Adjacent sequences: A127569 A127570 A127571 * A127573 A127574 A127575


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Jan 19 2007


EXTENSIONS

Edited by Franklin T. AdamsWatters, Aug 24 2011


STATUS

approved



