id:A015710 - OEIS Search Results

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Least k such that phi(n) * sigma(n) + k^2 is a perfect square, or zero if impossible.

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1, 0, 1, 1, 0, 1, 1, 1, 2, 0, 3, 1, 3, 1, 0, 2, 29, 1, 0, 1, 5, 4, 1, 1, 2, 26, 5, 3, 2, 1, 0, 1, 4, 1, 6, 2, 8, 1, 3, 5, 2, 1, 2, 1, 1, 8, 4, 1, 15, 0, 16, 0, 7, 1, 7, 6, 6, 6, 9, 1, 4, 1, 6, 10, 119, 8, 6, 1, 8, 1, 5, 1, 9, 1, 11, 9, 1, 4, 8, 1, 17, 0, 1, 1, 10, 12, 9, 2, 5, 1, 3, 6, 2, 8 (list; graph; listen)

	OFFSET	`0,9`
	REFERENCES	`R. K. Guy, Divisors and desires, Amer. Math. Monthly, 104 (1997), 359-360.`
	CROSSREFS	`Sequence in context: A125943 A098006 A082650 this_sequence A054875 A029239 A029219` `Adjacent sequences: A015707 A015708 A015709 this_sequence A015711 A015712 A015713`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com)`

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Last modified November 30 22:12 EST 2008. Contains 150989 sequences.

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