A078879 Triangle read by rows: T(n,k) = ceiling(k^2 / n), 0 < k <= n.

0, 1, 0, 1, 2, 0, 1, 1, 3, 0, 1, 1, 2, 4, 0, 1, 1, 2, 3, 5, 0, 1, 1, 2, 3, 4, 6, 0, 1, 1, 2, 2, 4, 5, 7, 0, 1, 1, 1, 2, 3, 4, 6, 8, 0, 1, 1, 1, 2, 3, 4, 5, 7, 9, 0, 1, 1, 1, 2, 3, 4, 5, 6, 8, 10, 0, 1, 1, 1, 2, 3, 3, 5, 6, 7, 9, 11, 0, 1, 1, 1, 2, 2, 3, 4, 5, 7, 8, 10, 12, 0, 1, 1, 1, 2, 2, 3, 4, 5, 6, 8, 9, 11

Offset

1,5

Links

Table of n, a(n) for n=1..103.

Example

0;
1, 0;
1, 2, 0;
1, 1, 3, 0;
1, 1, 2, 4, 0;
...

Prog

(PARI) {T(n, k) = if( n<1 || k>=n, 0, ceil(k^2 / n))}

Crossrefs

Rows sums is A014811.

Sequence in context: A286471 A176079 A067586 * A082859 A083537 A231353

Adjacent sequences: A078876 A078877 A078878 * A078880 A078881 A078882

Keyword

easy,nonn,tabl

Author

Michael Somos, Dec 13 2002

Status

approved