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A130208 Diagonalized matrix of A000203, Sigma(n). 5

%I #4 Feb 14 2013 17:46:00

%S 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,

%T 0,15

%N Diagonalized matrix of A000203, Sigma(n).

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

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

%e First few rows of the triangle are:

%e 1;

%e 0, 3;

%e 0, 0, 4;

%e 0, 0, 0, 7;

%e 0, 0, 0, 0, 6;

%e 0, 0, 0, 0, 0, 12;

%e ...

%o (PARI) for(n=1,9,for(k=2,n,print1("0, "));print1(sigma(n)", ")) \\ _Charles R Greathouse IV_, Feb 14 2013

%Y Cf. A000203, A130207, A130209.

%K nonn,tabl

%O 1,3

%A _Gary W. Adamson_, May 16 2007

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Last modified March 28 11:46 EDT 2024. Contains 371241 sequences. (Running on oeis4.)