login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A127510
Triangle T(n,k) = k*mobius(n).
2
1, -1, -2, -1, -2, -3, 0, 0, 0, 0, -1, -2, -3, -4, -5, 1, 2, 3, 4, 5, 6, -1, -2, -3, -4, -5, -6, -7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
OFFSET
1,3
FORMULA
T(n,k) = A008683(n)*k.
EXAMPLE
First few rows of the triangle are:
1;
-1, -2;
-1, -2, -3;
0, 0, 0, 0;
-1, -2, -3, -4, -5;
1, 2, 3, 4, 5, 6;
...
MAPLE
A127510 := proc(n, k)
numtheory[mobius](n)*k ;
end proc: # R. J. Mathar, Sep 08 2013
CROSSREFS
Cf. A008683, A000217, A125287 (row sums).
Sequence in context: A092186 A138262 A276990 * A328362 A158810 A129391
KEYWORD
tabl,easy,sign
AUTHOR
Gary W. Adamson, Jan 17 2007
STATUS
approved