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

Offset: 1

Author

Donald S. McDonald, Nov 10 2002

Keywords

• more
• nonn
• tabl
• obsc

Comments

Second solution. Both solutions are smaller than A076031.

Examples

			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

Cf. A076031, A076596.

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