A291075 Trajectory of the word "211" under the Watanabe tag system {11, 2122} described in A291067 (adapted to the alphabet {1,2}).

211, 2122, 22122, 222122, 1222122, 212211, 2112122, 21222122, 221222122, 2221222122, 12221222122, 2122212211, 22122112122, 221121222122, 1212221222122, 222122212211, 1222122112122, 212211212211, 2112122112122, 21221121222122, 211212221222122, 2122212221222122

Offset: 1

Author

N. J. A. Sloane, Aug 18 2017

Keywords

• nonn

Comments

At step 172, enters a cycle of length 6.

Working this out by hand, one is convinced that it is going to blow up. The cycle after reaching 11111121222122212211111121222122212211111121222122212211

comes as a surprise!

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..200

Crossrefs

Cf. A291067, A291072.