id:A015709 - OEIS Search Results

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Composite n such that phi(n) * sigma(n) is one less than a square.

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6, 22, 33, 44, 69, 76, 82, 140, 190, 295, 354, 392, 423, 451, 531, 581, 650, 944, 1072, 1119, 1142, 1150, 1668, 2276, 2893, 4043, 4163, 4176, 4192, 4257, 4262, 4509, 5090, 5975, 7260, 8660, 12977, 14927, 15026, 15753, 16064, 19105 (list; graph; listen)

	OFFSET	`0,1`
	REFERENCES	`R. K. Guy, Divisors and desires, Amer. Math. Monthly, 104 (1997), 359-360.`
	CROSSREFS	`Sequence in context: A037204 A035285 A069824 this_sequence A020195 A035134 A075799` `Adjacent sequences: A015706 A015707 A015708 this_sequence A015710 A015711 A015712`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com)`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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