A131876 2*A131873 - 1.

1, 15, 7, 29, 15, 13, 43, 23, 21, 19, 57, 31, 29, 27, 25, 71, 39, 37, 35, 33, 31, 85, 47, 45, 43, 41, 39, 37, 99, 55, 53, 51, 49, 47, 45, 43, 113, 63, 61, 59, 57, 55, 53, 51, 49, 127, 71, 69, 67, 65, 63, 61, 59, 57, 55, 141, 79, 77, 75, 73, 71, 69, 67, 65, 63, 61, 155, 87, 85, 83, 81, 79, 77, 75, 73, 71, 69, 67, 169, 95, 93, 91, 89, 87, 85, 83, 81, 79, 77, 75, 73, 183, 103, 101, 99, 97, 95, 93, 91, 89, 87, 85, 83, 81, 79

Offset

0,2

Comments

Left column = 14n + 1, A131877: (1, 15, 29, 43, 57, 21, ...).

Right border = 6n + 1, A016921: (1, 7, 13, 19, ...).

Row sums = A131878 (1, 22, 57, 106, 169, ...).

Links

Table of n, a(n) for n=0..104.

Formula

2*A131873 - 1 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
  15,  7;
  29, 15, 13;
  43, 23, 21, 19;
  57, 31, 29, 27, 25;
  71, 39, 37, 35, 33, 31;
  85, 47, 45, 43, 41, 39, 37;
  ...

Crossrefs

Cf. A131877, A131878, A131873.

Sequence in context: A133817 A173447 A168211 * A325136 A126070 A305998

Adjacent sequences: A131873 A131874 A131875 * A131877 A131878 A131879

Keyword

nonn,tabl,changed

Author

Gary W. Adamson, Jul 22 2007

Extensions

More terms from Russ Cox, Apr 18 2024

Status

approved