id:A067727 - OEIS Search Results

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Numbers such that 7 (7 + n) is a perfect square.

+0
5

21, 56, 105, 168, 245, 336, 441, 560, 693, 840, 1001, 1176, 1365, 1568, 1785, 2016, 2261, 2520, 2793, 3080, 3381, 3696, 4025, 4368, 4725, 5096, 5481, 5880, 6293, 6720, 7161, 7616, 8085, 8568, 9065, 9576, 10101, 10640, 11193, 11760, 12341, 12936 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n+1)= 7nn +28*n +21 (frank.ellermann(AT)t-online.de).`
	MATHEMATICA	`Select[ Range[15000], IntegerQ[ Sqrt[ 7(7 + # )]] & ]`
	CROSSREFS	`Cf. 8: A067728, 6: A067726, 5: A067724, 3: A067725.` `Sequence in context: A083676 A145719 A031963 this_sequence A165237 A146560 A043382` `Adjacent sequences: A067724 A067725 A067726 this_sequence A067728 A067729 A067730`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 05 2002`

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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