id:A066451 - OEIS Search Results

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a(n) is the number of integers k > 0 such that (n*k+1)/(k^2+1) is an integer.

+0
2

1, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 2, 3, 1, 2, 1, 3, 1, 2, 1, 3, 2, 3, 1, 2, 1, 3, 1, 2, 1, 3, 2, 3, 1, 2, 1, 3, 2, 2, 1, 2, 2, 4, 1, 2, 1, 3, 1, 2, 1, 2, 2, 3, 1, 3, 1, 5, 1, 2, 1, 2, 2, 3, 1, 2, 1, 3, 1, 2, 1, 2, 3, 4, 1, 2, 1, 3, 1, 2, 2, 2, 2, 4, 1, 2, 1, 3, 1, 3, 1, 3, 2, 3, 1, 2, 1, 3, 1, 2, 1, 2, 2, 3, 1, 2 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`a(57)=5 because (57*k+1)/(k^2+1) is an integer for k = 1,2,5,7,57.`
	CROSSREFS	`Sequence in context: A062356 A055881 A055874 this_sequence A091090 A066075 A072347` `Adjacent sequences: A066448 A066449 A066450 this_sequence A066452 A066453 A066454`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 29 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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