id:A116002 - OEIS Search Results

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n*phi(n)*phi(phi(n)) is a square.

+0
3

1, 8, 27, 32, 108, 128, 243, 250, 432, 512, 686, 972, 1000, 1331, 1728, 2048, 2187, 2197, 2744, 3375, 3888, 4000, 5324, 6174, 6250, 6912, 8192, 8748, 8788, 9826, 10976, 13500, 15552, 16000, 19683, 19773, 21296, 24696, 25000, 27648, 30375 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`15552phi(15552)phi(phi(15552))=373248^2.`
	CROSSREFS	`Cf. A055744.` `Sequence in context: A056729 A070265 A102834 this_sequence A097054 A056824 A051760` `Adjacent sequences: A115999 A116000 A116001 this_sequence A116003 A116004 A116005`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 13 2006`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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