id:A069018 - OEIS Search Results

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Smallest square k>0 such that n*k +1 is also a square or 0 if no such term exists. i.e. when n is a square.

+0
2

0, 4, 1, 0, 16, 4, 9, 1, 0, 36, 9, 4, 32400, 16, 1, 0, 64, 16, 1521, 4, 144, 1764, 25, 1, 0, 100, 25, 576, 3312400, 4, 74529, 9, 16, 36, 1, 0, 144, 36, 16, 9, 102400, 4, 281961, 900, 576, 12873744, 49, 1, 0, 196, 49, 8100, 82810000, 4356, 144, 4, 400, 6625476 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Program and terms from Robert G. Wilson v.`
	MAPLE	`Do[k = 0; If[ !IntegerQ[ Sqrt[n]], k = 1; While[ !IntegerQ[ Sqrt[n*k^2 + 1]], k++ ]]; Print[k^2], {n, 1, 35}]`
	CROSSREFS	`Sequence in context: A060638 A007789 A081114 this_sequence A156811 A130636 A117414` `Adjacent sequences: A069015 A069016 A069017 this_sequence A069019 A069020 A069021`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 02 2002`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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