A130207 Diagonalized matrix of A000010.

1, 0, 1, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0

Offset

1,6

Links

Table of n, a(n) for n=1..83.

Formula

T(n,n) = A000010(n).

T(n,k) = 0, if k <> n.

Example

First few rows of the triangle are:
1;
0, 1;
0, 0, 2;
0, 0, 0, 2;
0, 0, 0, 0, 4;
...

Maple

A130207 := proc(n, k)
    if k = n then
        numtheory[phi](n);
    else
        0;
    end if;
end proc:
seq(seq(A130207(n, k), k=1..n), n=1..15) ;

Prog

(PARI) for(n=1, 9, for(k=2, n, print1("0, ")); print1(eulerphi(n)", ")) \\ Charles R Greathouse IV, Feb 19 2013

Crossrefs

Cf. A000010, A130208, A130209.

Sequence in context: A070202 A280129 A227344 * A325433 A167688 A083914

Adjacent sequences: A130204 A130205 A130206 * A130208 A130209 A130210

Keyword

nonn,tabl,easy

Author

Gary W. Adamson, May 16 2007

Status

approved