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Triangle read by rows: n-th row contains n numbers whose product is a square; all numbers in triangle are distinct.
2

%I #9 Sep 11 2023 11:46:05

%S 1,2,8,3,7,21,4,5,6,30,9,10,12,15,18

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

%C Second solution. Both solutions are smaller than A076031.

%e 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)

%Y Cf. A076031, A076596.

%K more,nonn,tabl,obsc

%O 1,2

%A _Donald S. McDonald_, Nov 10 2002

%E 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