A053473 - OEIS

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A053473

Cototient of n (A051953) iterated 5 times.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 0, 1, 0, 2, 0, 2, 0, 2, 0, 2, 0, 4, 0, 2, 0, 2, 0, 2, 0, 4, 0, 2, 0, 4, 0, 2, 0, 4, 0, 4, 0, 2, 0, 2, 0, 4, 0, 4, 0, 4, 0, 4, 0, 4, 0, 4, 0, 8, 0, 4, 0, 8, 0, 8, 0, 4, 0, 4, 0, 8, 0, 4, 0, 4, 0, 4, 0, 4, 0, 8, 0, 8, 0, 4, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,30`
	COMMENTS	`As iteration of A051953 progresses, more and more powers of 2 and 0 appear. The fixed point is 0 . Analogous 5th iterates for A000005 or A000010 are A036453 and A049107`
	EXAMPLE	`n=50, n_1=n-Phi[n]=50-20=30, n_2=n_1-Phi[n_1]=30-8=22, n_3=22-Phi[22]=12, n_4 = n_3-Phi[n_3]=12-4=8, n_5=8-Phi[8]=4 so the 50th term is 4.`
	CROSSREFS	`A051953, A000005, A000010, A036453, A049107.` `Sequence in context: A091394 A029881 A070090 * A144764 A084929 A054014` `Adjacent sequences: A053470 A053471 A053472 * A053474 A053475 A053476`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 14 2000`

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.