|
|
A076696
|
|
Triangle read by rows: n-th row contains n numbers whose product is a square; all numbers in triangle are distinct.
|
|
2
|
|
|
1, 2, 8, 3, 7, 21, 4, 5, 6, 30, 9, 10, 12, 15, 18
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
Second solution. Both solutions are smaller than A076031.
|
|
LINKS
|
|
|
EXAMPLE
|
1^2 4^2 21^2 60^2 540^2 = (1)(2 8)(3 7 21)(4 5 6 30)(9 10 12 15 18)
|
|
CROSSREFS
|
|
|
KEYWORD
|
|
|
AUTHOR
|
|
|
EXTENSIONS
|
It is not clear to me how one decides what numbers to place in the n-th row! - N. J. A. Sloane, Nov 30 2002
|
|
STATUS
|
approved
|
|
|
|