id:A039771 - OEIS Search Results

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phi(a(n)) is a perfect cube.

+0
9

1, 2, 15, 16, 20, 24, 30, 85, 128, 136, 160, 170, 192, 204, 240, 247, 259, 327, 333, 351, 399, 405, 436, 494, 518, 532, 648, 654, 666, 684, 702, 756, 771, 798, 810, 1024, 1028, 1088, 1111, 1255, 1280, 1360, 1375, 1536, 1542, 1632, 1843, 1853, 1875 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`phi(247)=216=666.`
	MATHEMATICA	`Select[ Range[ 2000 ], IntegerQ[ Power[ EulerPhi[ # ], 1/3 ] ]& ]`
	CROSSREFS	`Cf. A000010, A007614.` `Sequence in context: A102101 A037312 A108472 this_sequence A032934 A114606 A022117` `Adjacent sequences: A039768 A039769 A039770 this_sequence A039772 A039773 A039774`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr)`

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Last modified July 19 08:04 EDT 2008. Contains 142098 sequences.

AT&T Labs Research