id:A114078 - OEIS Search Results

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phi(n) times sigma(n) is a fourth power.

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1, 170, 595, 714, 121056, 480441, 529620, 706063, 706237, 729752, 755972, 815654, 2162808, 2449062, 2827789, 2927848, 2957416, 2994681, 2995419, 3010227, 3019028, 3019772, 3080140, 3093860, 3103464, 3206364, 3213804 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 170, p. 54, Ellipses, Paris 2008.`
	EXAMPLE	`phi(595) * sigma(595) = 331776 = 24^4.`
	CROSSREFS	`Adjacent sequences: A114075 A114076 A114077 this_sequence A114079 A114080 A114081` `Sequence in context: A045041 A063943 A045089 this_sequence A031704 A133328 A098244`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

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Last modified October 15 09:18 EDT 2008. Contains 145015 sequences.

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