id:A049099 - OEIS Search Results

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Euler phi function applied thrice to n.

+0
4

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 4, 1, 2, 2, 2, 2, 4, 2, 4, 2, 2, 2, 4, 2, 4, 4, 4, 4, 4, 2, 4, 2, 4, 4, 8, 2, 4, 4, 4, 4, 10, 4, 4, 4, 8, 4, 8, 2, 8, 4, 4, 4, 12, 4, 8, 4, 4, 8, 8, 4, 8, 8, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 8, 6, 8, 16, 4, 16, 4, 8, 8, 16, 4, 8, 8, 8, 10, 8, 8, 16, 4, 8, 8, 16 (list; graph; listen)

	OFFSET	`1,11`
	EXAMPLE	`n=163: the successive iterates of Euler totient function are 163,162,54,18,6,2,1. The 4th term is 18, when Phi was applied 3 times. So a(163)=18`
	MATHEMATICA	`a(n)=Nest[ EulerPhi, n, 3 ]`
	CROSSREFS	`Cf. A000010, A010554.` `Sequence in context: A161258 A161283 A002300 this_sequence A143179 A089610 A102566` `Adjacent sequences: A049096 A049097 A049098 this_sequence A049100 A049101 A049102`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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