A125093 - OEIS

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A125093

Triangle T(n,k) = n*A054525(n,k) read by rows.

3

1, -2, 2, -3, 0, 3, 0, -4, 0, 4, -5, 0, 0, 0, 5, 6, -6, -6, 0, 0, 6, -7, 0, 0, 0, 0, 0, 7, 0, 0, 0, -8, 0, 0, 0, 8, 0, 0, -9, 0, 0, 0, 0, 0, 9, 10, -10, 0, 0, -10, 0, 0, 0, 0, 10, -11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 12, 0, -12, 0, -12, 0, 0, 0, 0, 0, 12, -13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 14, -14, 0, 0, 0, 0, -14, 0, 0, 0, 0, 0, 0, 14, 15, 0, -15, 0

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..109.

FORMULA

T(n,1) = n*mu(n) = A055615(n).

EXAMPLE

First few rows of the triangle are:

1;

-2, 2;

-3, 0, 3;

0, -4, 0, 4;

-5, 0, 0, 0, 5;

6, -6, -6, 0, 0, 6;

-7, 0, 0, 0, 0, 0, 7;

...

MAPLE

A125093 := proc(n, k) if n = k then n; elif n mod k = 0 then n*numtheory[mobius](n/k) ; else 0; end if; end proc:

seq(seq(A125093(n, k), k=1..n), n=1..16) ; # R. J. Mathar, Apr 10 2011

CROSSREFS

Cf. A055615, A051731, A127648.

Sequence in context: A053761 A138067 A324348 * A294898 A297114 A318448

Adjacent sequences: A125090 A125091 A125092 * A125094 A125095 A125096

KEYWORD

tabl,easy,sign

AUTHOR

Gary W. Adamson, Jan 22 2007

EXTENSIONS

Offset and definition corrected by R. J. Mathar, Apr 10 2011

STATUS

approved