A076696 - OEIS

A076696

Triangle read by rows: n-th row contains n numbers whose product is a square; all numbers in triangle are distinct.

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

more,nonn,tabl,obsc

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