id:A110660 - OEIS Search Results

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Pronic numbers repeated.

+0
5

0, 0, 2, 2, 6, 6, 12, 12, 20, 20, 30, 30, 42, 42, 56, 56, 72, 72, 90, 90, 110, 110, 132, 132, 156, 156, 182, 182, 210, 210, 240, 240, 272, 272, 306, 306, 342, 342, 380, 380, 420, 420, 462, 462, 506, 506, 552, 552, 600, 600, 650, 650, 702, 702, 756, 756, 812, 812 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`a(floor(n/2)) = A002378(n);` `a(n) = A028242(n) * A110654(n) = A008805(n)/2.`
	LINKS	`Eric Weisstein's World of Mathematics, Pronic Number`
	FORMULA	`a(n) = floor(n/2)*(floor(n/2)+1).`
	CROSSREFS	`Cf. A109613.` `Sequence in context: A032043 A028476 A051548 this_sequence A139550 A060549 A120690` `Adjacent sequences: A110657 A110658 A110659 this_sequence A110661 A110662 A110663`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 05 2005`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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