

A130208


Diagonalized matrix of A000203, Sigma(n).


5



1, 0, 3, 0, 0, 4, 0, 0, 0, 7, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 15
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OFFSET

1,3


COMMENTS

A130207 replaces Sigma(n) with phi(n), A000010. A130209 replaces Sigma(n) with d(n), A000005.


LINKS

Table of n, a(n) for n=1..36.


FORMULA

Infinite lower triangular matrix with A000203, Sigma(n), in the main diagonal and the rest zeros.


EXAMPLE

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


PROG

(PARI) for(n=1, 9, for(k=2, n, print1("0, ")); print1(sigma(n)", ")) \\ Charles R Greathouse IV, Feb 14 2013


CROSSREFS

Cf. A000203, A130207, A130209.
Sequence in context: A021773 A244126 A133109 * A288654 A259191 A240455
Adjacent sequences: A130205 A130206 A130207 * A130209 A130210 A130211


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, May 16 2007


STATUS

approved



