A134674 A134673 * A000012.

1, 2, 2, 3, 3, 3, 4, 3, 4, 4, 5, 5, 5, 5, 5, 5, 3, 4, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 8, 8, 8, 8, 8, 7, 7, 9, 9, 9, 9, 9, 9, 7, 5, 6, 6, 6, 10, 10, 10, 10, 10

Offset

1,2

Comments

Left column = A073757: (1, 2, 3, 4, 5, 5, 7, 8, 8, 7, ...).

Row sums = A134675: (1, 4, 9, 15, 25, 30, 49, 55, 80, ...).

n-th row (n>1) has n terms of "n", iff n is prime.

Links

Table of n, a(n) for n=1..55.

Formula

A134673 * A000012 as infinite lower triangular matrices. Triangle, partial sums of A134673 starting from the right of each row.

A134674(n,k) = Sum_{j=n-k+1..n} A134673(n,j).

Example

First few rows of the triangle:
  1;
  2,  2;
  3,  3,  3;
  4,  3,  4,  4;
  5,  5,  5,  5,  5;
  5,  3,  4,  6,  6,  6;
  7,  7,  7,  7,  7,  7,  7;
  7,  6,  5,  5,  8,  8,  8,  8;
  8,  7,  7,  9,  9,  9,  9,  9,  9;
  7,  5,  6,  6,  6, 10, 10, 10, 10, 10;
  ...

Crossrefs

Cf. A134673, A134675, A073757.

Sequence in context: A126302 A200648 A264982 * A253894 A000121 A230022

Adjacent sequences: A134671 A134672 A134673 * A134675 A134676 A134677

Keyword

nonn,tabl,more

Author

Gary W. Adamson, Nov 05 2007

Status

approved