A104472 Triangle of degree numbers for certain polynomials.

1, 2, 4, 3, 5, 8, 4, 8, 11, 15, 5, 9, 12, 16, 21, 6, 12, 18, 22, 27, 33, 7, 13, 19, 23, 28, 34, 41, 8, 16, 22, 30, 35, 41, 48, 56, 9, 17, 26, 34, 39, 45, 52, 60, 69, 10, 20, 29, 37, 47, 53, 60, 68, 77, 87, 11, 21, 30, 38, 48, 54, 61, 69, 78, 88, 99, 12, 24, 36, 48, 58, 70, 77, 85

Offset

1,2

Comments

This is the array ay(N,m)= A104471(n+m-1,m) with numbers m>N omitted because they are identical with ay(N,N).

a(n,m)=sum(j*floor(n/j),j=1..m), n>=m and zero else (but actually one should repeat the a(n,n) numbers for n<m).

Links

Table of n, a(n) for n=1..74.

W. Lang: First 10 rows.

Example

[1]; [2,4]; [3,5,8]; [4,8,11,15]; [5,9,12,16,21]; ...

Crossrefs

Main diagonal a(n, n)= A024916(n), n>=1.

Sequence in context: A232798 A155850 A134464 * A316964 A187790 A307613

Adjacent sequences: A104469 A104470 A104471 * A104473 A104474 A104475

Keyword

nonn,easy,tabl

Author

Wolfdieter Lang, Mar 24 2005

Status

approved