id:A115878 - OEIS Search Results

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a(n) is the number of positive solutions of the diophantine equation x^2=y(y+n).

+0
4

0, 0, 1, 0, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 4, 2, 1, 2, 1, 1, 4, 1, 1, 4, 2, 1, 3, 1, 1, 4, 1, 3, 4, 1, 4, 2, 1, 1, 4, 4, 1, 4, 1, 1, 7, 1, 1, 7, 2, 2, 4, 1, 1, 3, 4, 4, 4, 1, 1, 4, 1, 1, 7, 4, 4, 4, 1, 1, 4, 4, 1, 7, 1, 1, 7, 1, 4, 4, 1, 7, 4, 1, 1, 4, 4, 1, 4, 4, 1, 7, 4, 1, 4, 1, 4, 10, 1, 2, 7, 2, 1, 4 (list; graph; listen)

	OFFSET	`1,9`
	EXAMPLE	`a(15)=4 since there are 4 solutions (x,y) to x^2=y(y+15), namely (4,1), (10,5), (18, 12), and (56, 49).`
	CROSSREFS	`Cf. A067721, A115879, A115880, A115881.` `Sequence in context: A132068 A129192 A062540 this_sequence A127125 A114171 A140345` `Adjacent sequences: A115875 A115876 A115877 this_sequence A115879 A115880 A115881`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 02 2006`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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