id:A049200 - OEIS Search Results

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Euler phi values of square-free numbers in order of magnitude of consecutive square-free arguments.

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1, 1, 2, 4, 2, 6, 4, 10, 12, 6, 8, 16, 18, 12, 10, 22, 12, 28, 8, 30, 20, 16, 24, 36, 18, 24, 40, 12, 42, 22, 46, 32, 52, 40, 36, 28, 58, 60, 30, 48, 20, 66, 44, 24, 70, 72, 36, 60, 24, 78, 40, 82, 64, 42, 56, 88, 72, 60, 46, 72, 96, 100, 32, 102, 48, 52, 106, 108, 40, 72 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`The 12th square-free number A005117(12)=17, and Phi[ 17 ]=A000010(A005117(12)=16=a(12)`
	MATHEMATICA	`EulerPhi[ x ] if Abs[ MoebiusMu[ x ] ]=1`
	CROSSREFS	`A000010, A005117, A013929.` `Adjacent sequences: A049197 A049198 A049199 this_sequence A049201 A049202 A049203` `Sequence in context: A010241 A102128 A105393 this_sequence A083791 A026251 A085190`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

AT&T Labs Research