id:A067722 - OEIS Search Results

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Least number k such that n (n + k) is a perfect square.

+0
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1, 3, 6, 9, 5, 15, 18, 21, 10, 7, 30, 33, 15, 39, 42, 45, 9, 51, 14, 57, 25, 63, 66, 69, 30, 11, 78, 21, 35, 87, 90, 93, 18, 99, 102, 105, 13, 111, 114, 117, 50, 123, 126, 129, 55, 35, 138, 141, 27, 15, 22, 153, 65, 159, 42, 165, 70, 171, 174, 177, 75, 183, 186, 49, 17 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`a(8) = 10 because 8 (8+10) = 144 = 12^2.`
	MATHEMATICA	`Do[k = 1; While[ !IntegerQ[ Sqrt[ k (k + n)]], k++ ]; Print[k], {n, 0, 75} ]`
	CROSSREFS	`Sequence in context: A163341 A019700 A151862 this_sequence A049341 A137991 A021077` `Adjacent sequences: A067719 A067720 A067721 this_sequence A067723 A067724 A067725`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 05 2002`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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