id:A067724 - OEIS Search Results

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Numbers such that 5 (5 + n) is a perfect square.

+0
7

15, 40, 75, 120, 175, 240, 315, 400, 495, 600, 715, 840, 975, 1120, 1275, 1440, 1615, 1800, 1995, 2200, 2415, 2640, 2875, 3120, 3375, 3640, 3915, 4200, 4495, 4800, 5115, 5440, 5775, 6120, 6475, 6840, 7215, 7600, 7995, 8400, 8815, 9240, 9675 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n+1)= 5nn +20*n +15 (frank.ellermann(AT)t-online.de).`
	MATHEMATICA	`Select[ Range[10000], IntegerQ[ Sqrt[ 5(5 + # )]] & ]`
	CROSSREFS	`Cf. 8: A067728, 7: A067727, 6: A067726, 3: A067725.` `Sequence in context: A062222 A044092 A044473 this_sequence A005337 A038991 A068020` `Adjacent sequences: A067721 A067722 A067723 this_sequence A067725 A067726 A067727`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 05 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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