A130208 - OEIS

A130208

Diagonalized matrix of A000203, sigma(n).

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

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:

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

KEYWORD

nonn,tabl

AUTHOR

STATUS

approved