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A127446 Triangle T(n,k) = n*A051731(n,k) read by rows. +0
4
1, 2, 2, 3, 0, 3, 4, 4, 0, 4, 5, 0, 0, 0, 5, 6, 6, 6, 0, 0, 6, 7, 0, 0, 0, 0, 0, 7, 8, 8, 0, 8, 0, 0, 0, 8, 9, 0, 9, 0, 0, 0, 0, 0, 9, 10, 10, 0, 0, 10, 0, 0, 0, 0, 10, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 12, 12, 12, 12, 0, 12, 0, 0, 0, 0, 0, 12, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13, 14, 14, 0, 0, 0, 0, 14 (list; table; graph; listen)
OFFSET

1,2

COMMENT

Replace the 1's in row n of A051731 with n's.

FORMULA

Row sums: sum_{k=1..n} T(n,k) = A038040(n).

EXAMPLE

First few rows of the triangle are:

1;

2, 2;

3, 0, 3;

4, 4, 0, 4;

5, 0, 0, 0, 5;

6, 6, 6, 0, 0, 6;

7, 0, 0, 0, 0, 0, 7;

...

MAPLE

A127446 := proc(n, k) if n mod k = 0 then n; else 0; fi; end: for n from 1 to 20 do for k from 1 to n do printf("%d, ", A127446(n, k)) ; od: od: # R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 08 2009

CROSSREFS

Cf. A038040, A051731.

Sequence in context: A125093 A103516 A129234 this_sequence A046157 A035167 A100890

Adjacent sequences: A127443 A127444 A127445 this_sequence A127447 A127448 A127449

KEYWORD

nonn,tabl,easy

AUTHOR

Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 14 2007

EXTENSIONS

Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 08 2009

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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