A133115 Triangle read by rows: 2*A133113 - A000012 as infinite lower triangular matrices.

1, 3, 1, 7, 3, 1, 11, 7, 7, 1, 17, 11, 21, 7, 1, 23, 17, 47, 21, 11, 1, 31, 23, 91, 47, 43, 11, 1, 39, 31, 159, 91, 123, 43, 15, 1, 49, 39, 259, 159, 295, 123, 73, 15, 1, 59, 49, 399, 259, 627, 295, 255, 73, 19, 1, 71, 59, 589, 399, 1219, 627, 733, 255, 111, 19, 1, 83, 71, 839, 589, 2211, 1219, 1839, 733, 459, 111, 23, 1

Offset

1,2

Comments

Left column = A047838: (1, 3, 7, 11, 17, 23, ...).

Row sums = A000295: (1, 4, 11, 26, 57, ...).

Links

Table of n, a(n) for n=1..78.

Example

First few rows of the triangle:
   1;
   3,  1;
   7,  3,  1;
  11,  7,  7,  1;
  17, 11, 21,  7,  1;
  23, 17, 47, 21, 11,  1;
  31, 23, 91, 47, 43, 11,  1;
  ...

Crossrefs

Cf. A000295, A047838, A133113.

Sequence in context: A365454 A059090 A327990 * A210192 A249755 A249248

Adjacent sequences: A133112 A133113 A133114 * A133116 A133117 A133118

Keyword

nonn,tabl

Author

Gary W. Adamson, Sep 14 2007

Extensions

a(46) = 59 corrected and more terms from Georg Fischer, Jun 10 2023

Status

approved