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Cycle of length 54. Case a(1)=3: A016081.
Table of n, a(n) for n=1..61.
All of A003608, A016081, A016082 (and possibly others) eventually reach the trajectory of 1 shown in A119031. Cf. A055198.
Sequence in context: A242329 A214902 A049602 * A271129 A271152 A271164
Adjacent sequences: A119028 A119029 A119030 * A119032 A119033 A119034
Zak Seidov, May 09 2006
Cycle length corrected by N. J. A. Sloane, Aug 02 2009