A131899 A002260 + A131821 - A000012.

1, 2, 3, 3, 2, 5, 4, 2, 3, 7, 5, 2, 3, 4, 9, 6, 2, 3, 4, 5, 11, 7, 2, 3, 4, 5, 6, 13, 8, 2, 3, 4, 5, 6, 7, 15, 9, 2, 3, 4, 5, 6, 7, 8, 17, 10, 2, 3, 4, 5, 6, 7, 8, 9, 19

Offset

0,2

Comments

Row sums = A052905: (1, 5, 10, 16, 23, ...)

Links

Table of n, a(n) for n=0..54.

Formula

A002260 + A131821 - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
  1;
  2,  3;
  3,  2,  5;
  4,  2,  3,  7;
  5,  2,  3,  4,  9;
  6,  2,  3,  4,  5, 11;
  7,  2,  3,  4,  5,  6, 13;
  ...

Crossrefs

Cf. A002260, A131821, A052905.

Sequence in context: A326699 A138652 A323833 * A095174 A131307 A336168

Adjacent sequences: A131896 A131897 A131898 * A131900 A131901 A131902

Keyword

nonn,tabl

Author

Gary W. Adamson, Jul 25 2007

Status

approved