

A143235


Triangle read by rows: T(n,k) = tau(n)*tau(k), the product of the number of divisors.


2



1, 2, 4, 2, 4, 4, 3, 6, 6, 9, 2, 4, 4, 6, 4, 4, 8, 8, 12, 8, 16, 2, 4, 4, 6, 4, 8, 4, 4, 8, 8, 12, 8, 16, 8, 16, 3, 6, 6, 9, 6, 12, 6, 12, 9, 4, 8, 8, 12, 8, 16, 8, 16, 12, 16, 2, 4, 4, 6, 4, 8, 4, 8, 6, 8, 4, 6, 12, 12, 18, 12, 24, 12, 24, 18, 24, 12, 36, 2, 4, 4, 6, 4, 8, 4, 8, 6, 8, 4, 12, 4
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OFFSET

1,2


COMMENTS



LINKS



FORMULA



EXAMPLE

First few rows of the triangle =
1;
2, 4;
2, 4, 4;
3, 6, 6, 9;
2, 4, 4, 6, 4;
4, 8, 8, 12, 8, 16;
2, 4, 4, 6, 4, 8, 4;
4, 8, 8, 12, 8, 16, 8, 16;
3, 6, 6, 9, 6, 12, 6, 12, 9;
...
T(9,6) = 12 = d(9)*d(6) = 3*4.


CROSSREFS



KEYWORD



AUTHOR



STATUS

approved



