id:A072389 - OEIS Search Results

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Numbers of the form x*(x+1) * y*(y+1) ("bipronics") with x and y nonnegative integers.

+0
3

0, 4, 12, 24, 36, 40, 60, 72, 84, 112, 120, 144, 180, 220, 240, 252, 264, 312, 336, 360, 364, 400, 420, 432, 480, 504, 540, 544, 600, 612, 660, 672, 684, 760, 792, 840, 864, 900, 924, 936, 1012, 1080, 1092, 1104, 1120, 1200, 1260, 1300, 1320 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A053990 gives sequence of bipronics with x and y distinct.`
	EXAMPLE	`a(3) = 122*3 = 12`
	CROSSREFS	`Sequence in context: A156678 A008211 A008077 this_sequence A071228 A108997 A159795` `Adjacent sequences: A072386 A072387 A072388 this_sequence A072390 A072391 A072392`
	KEYWORD	`nonn,easy`
	AUTHOR	`Stuart M. Ellerstein (ellerstein(AT)aol.com), Jul 20 2002`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jul 23 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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