id:A116009 - OEIS Search Results

Search: id:A116009

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Numbers n such that n + sigma(n) + phi(n) is a square.

+0
3

3, 81, 400, 972, 1209, 1276, 1480, 1833, 2700, 3408, 4080, 4345, 6321, 6498, 6885, 8673, 8697, 10257, 12325, 13192, 13240, 13409, 14496, 14560, 16932, 17232, 18168, 18904, 19140, 19344, 20196, 22896, 23568, 23920, 27001, 27313, 28305 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`81 + sigma(81) + phi(81) = 16^2.`
	CROSSREFS	`Cf. A116007, A116008.` `Adjacent sequences: A116006 A116007 A116008 this_sequence A116010 A116011 A116012` `Sequence in context: A011187 A137994 A074386 this_sequence A068562 A123656 A060851`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

AT&T Labs Research