id:A049107 - OEIS Search Results

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Euler phi function applied 5 times.

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3

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 1, 2, 4, 1, 4, 1, 2, 2, 4, 1, 2, 2, 2, 2, 2, 2, 4, 1, 2, 2, 4, 2, 4, 2, 2 (list; graph; listen)

	OFFSET	`1,41`
	EXAMPLE	`n=163, the successive iterates applying Euler totient function are as follows: 163,162,54,18,6,2,1. The 6th term is 2, when Phi was applied 5 times. So a(163)=2, already a power of 2.`
	MATHEMATICA	`a(n)=Nest[ EulerPhi, n, 5 ]`
	CROSSREFS	`A000010, A010554.` `Sequence in context: A074971 A132587 A008651 this_sequence A046597 A107910 A085006` `Adjacent sequences: A049104 A049105 A049106 this_sequence A049108 A049109 A049110`
	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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