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Consider Post's tag system applied to the word (100)^n; a(n) = position of the longest word in the orbit, or -1 if the orbit is unbounded.
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%I #13 Mar 29 2019 01:25:03

%S 3,14,9,16,97,34,1293,400,91,1734,49,1532,51,18168,271,78,395,674,265,

%T 260,2701,1068,143,935110,2949,1664,2781,2874,9883,3186,1313,996,

%U 109875,406,5949,57480,15941,258,32359,4712,1223,2424,469,35722,1481,1508,395,662

%N Consider Post's tag system applied to the word (100)^n; a(n) = position of the longest word in the orbit, or -1 if the orbit is unbounded.

%H Lars Blomberg, <a href="/A291796/b291796.txt">Table of n, a(n) for n = 1..6075</a>

%H Peter R. J. Asveld, <a href="http://doc.utwente.nl/66184/1/1988m20.pdf">On a Post's System of Tag</a>. Bulletin of the EATCS 36 (1988), 96-102.

%Y Cf. A284116 and the cross-references there.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Sep 04 2017

%E a(33) and beyond from _Lars Blomberg_, Apr 19 2018