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19 steps to see a repeat.
Table of n, a(n) for n=0..81.
Cf. A087712, A098282.
Sequence in context: A203096 A210822 A265622 * A209541 A279295 A053903
Adjacent sequences: A144912 A144913 A144914 * A144916 A144917 A144918
N. J. A. Sloane, Feb 18 2009