A133699 A051731 * A133698.

1, 1, 1, 1, 0, 2, 1, 1, 0, 1, 1, 0, 0, 0, 2, 1, 1, 2, 0, 0, 2, 1, 0, 0, 0, 0, 0, 2, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 2, 0, 0, 0, 0, 0, 3, 1, 1, 0, 0, 2, 0, 0, 0, 0, 2

Offset

1,6

Comments

Right border = A001227, the number of odd divisors of n.

Row sums = A133700: (1, 2, 3, 3, 3, 6, 3, 4, 6, 6, ...)

Links

Table of n, a(n) for n=1..55.

Formula

Inverse Mobius transform of A133698, as infinite lower triangular matrices.

Example

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

Crossrefs

Cf. A051731, A133698, A133700.

Sequence in context: A271592 A357187 A128409 * A157361 A369454 A224444

Adjacent sequences: A133696 A133697 A133698 * A133700 A133701 A133702

Keyword

nonn,tabl

Author

Gary W. Adamson, Sep 21 2007

Status

approved