A143258 Triangle read by rows, A054525 * A143257, 1<=k<=n.

1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 4, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 6, 1, 1, 1, 1, 1, 1, 4, 2, 1, 1, 1, 1, 1, 1, 6, 2, 2, 1, 1, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset

1,4

Comments

Left border = phi(n), A000010.

Row sums = A029935: (1, 2, 4, 5, 8, 8, 12, 12,...)

Links

Table of n, a(n) for n=1..105.

Formula

Mobius transform of triangle A143257

Example

First few rows of the triangle =
1;
1, 1;
2, 1, 1;
2, 1, 1, 1;
4, 1, 1, 1, 1;
2, 2, 1, 1, 1, 1;
6, 1, 1, 1, 1, 1, 1;
...

Crossrefs

Cf. A143257, A054525, A029935, A000010.

Sequence in context: A079211 A026835 A117975 * A027199 A140218 A193805

Adjacent sequences: A143255 A143256 A143257 * A143259 A143260 A143261

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 02 2008

Status

approved