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A053472 Cototient of n (A051953) iterated 4 times. 0
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 0, 1, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 4, 0, 2, 0, 4, 0, 4, 0, 4, 0, 4, 0, 8, 0, 4, 1, 4, 0, 4, 0, 8, 0, 4, 0, 8, 0, 4, 1, 8, 0, 8, 0, 4, 1, 4, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 16, 0, 8, 1, 12, 0, 16, 1, 8, 0, 8, 0, 16, 0, 8, 0, 8, 0, 8, 0, 8, 1, 16, 0, 16 (list; graph; refs; listen; history; internal format)
OFFSET

1,18

COMMENTS

As iteration of A051953 progresses, powers of 2 may appear and it ends at 0 fixed point. Analogous 4th iterates for A000005 or A000010 are A036452 and A049100

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 so the 50th term is 8.

CROSSREFS

A051953, A000005, A000010, A036452, A049100.

Sequence in context: A010673 A084099 A036665 * A036664 A045843 A181587

Adjacent sequences:  A053469 A053470 A053471 * A053473 A053474 A053475

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Jan 14 2000

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.