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A076696
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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.
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2
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1, 2, 8, 3, 7, 21, 4, 5, 6, 30, 9, 10, 12, 15, 18
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Second solution. Both solutions are smaller than A076031.
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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)
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CROSSREFS
| Cf. A076031, A076596.
Sequence in context: A190732 A081349 A111445 * A011057 A082236 A083003
Adjacent sequences: A076693 A076694 A076695 * A076697 A076698 A076699
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KEYWORD
| more,nonn,tabl
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AUTHOR
| Donald S. McDonald (don.mcdonald(AT)paradise.net.nz), Nov 10 2002
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EXTENSIONS
| It is not clear to me how one decides what numbers to place in the n-th row! - N. J. A. Sloane (njas(AT)research.att.com), Nov 30, 2002
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