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

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 * A363155 A364084 A288654

Adjacent sequences: A130205 A130206 A130207 * A130209 A130210 A130211

Keyword

nonn,tabl

Author

Gary W. Adamson, May 16 2007

Status

approved