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A049099 Euler phi function applied thrice to n. 3
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; refs; listen; history; internal format)
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 * A181776 A206941 A143179

Adjacent sequences:  A049096 A049097 A049098 * A049100 A049101 A049102

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu)

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Last modified February 17 12:38 EST 2012. Contains 206021 sequences.