A053471 - OEIS

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A053471

Cototient of n (A051953) iterated 3 times.

0, 0, 0, 0, 0, 1, 0, 1, 0, 2, 0, 2, 0, 2, 0, 2, 0, 4, 0, 4, 1, 4, 0, 4, 0, 4, 1, 4, 0, 8, 0, 4, 0, 8, 0, 8, 0, 8, 1, 8, 0, 12, 0, 8, 3, 8, 0, 8, 0, 12, 0, 8, 0, 16, 1, 8, 3, 12, 0, 16, 0, 8, 3, 8, 0, 16, 0, 16, 1, 16, 0, 16, 0, 12, 1, 16, 0, 24, 0, 16, 3, 22, 0, 24, 3, 16, 0, 16, 0, 24, 0, 16, 1, 16, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,10`
	COMMENTS	`Iteration of A051953 behaves similarly to that of Euler Phi. Analogous 3rd iterates for A000005) or A000010) are A036455 and A049099`
	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 so the 50th term is 12.`
	CROSSREFS	`A051953, A000005, A000010, A036455, A049099.` `Sequence in context: A045843 A181587 A096158 * A144078 A008614 A036663` `Adjacent sequences: A053468 A053469 A053470 * A053472 A053473 A053474`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 14 2000`

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Last modified February 15 18:22 EST 2012. Contains 205835 sequences.