A140705 A000012 * A051731^4.

1, 5, 1, 9, 1, 1, 19, 5, 1, 1, 23, 5, 1, 1, 1, 39, 9, 5, 1, 1, 1, 43, 9, 5, 1, 1, 1, 1, 63, 19, 5, 5, 1, 1, 1, 1, 73, 19, 9, 5, 1, 1, 1, 1, 1, 89, 23, 9, 5, 5, 1, 1, 1, 1, 1, 93, 23, 9, 5, 5, 1, 1, 1, 1, 1, 1

Offset

1,2

Comments

Row sums = A061203: (1, 6, 11, 26, 31, 56,...).

Left column = A061202: (1, 5, 9, 19, 23, 39,...).

Links

Table of n, a(n) for n=1..66.

Formula

A000012 * A051731^4 as infinite lower triangular matrices, where A051731 = the inverse Mobius transform and A000012 = an infinite lower triangular matrix with all 1's.

Example

First few rows of the triangle are:
1;
5, 1;
9, 1, 1;
19, 5, 1, 1;
23, 5, 1, 1, 1;
39, 9, 5, 1, 1, 1;
43, 9, 5, 1, 1, 1, 1;
63, 19, 5, 5, 1, 1, 1, 1;
...

Crossrefs

Cf. A051731, A061203, A061202.

Sequence in context: A193856 A255294 A115521 * A336053 A266072 A376018

Adjacent sequences: A140702 A140703 A140704 * A140706 A140707 A140708

Keyword

nonn,tabl

Author

Gary W. Adamson, May 24 2008

Extensions

a(60) split into 5,1 by Georg Fischer, Aug 27 2023

Status

approved