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A161593 Lengths of new periods in the RATS sequence (0 replacing infinity). 7

%I #18 Dec 31 2022 10:45:42

%S 0,8,2,18,2,2,2,14,2,3,2,2,2,6

%N Lengths of new periods in the RATS sequence (0 replacing infinity).

%C The values A114611(j) for those starting values j of the RATS mapping x->A036839(x) which end in cycles that cannot be reached starting from any smaller j.

%C Every integer > 1 appears in this sequence. - _Andrey Zabolotskiy_, Jun 11 2017

%C For other terms see Branicky link. - _Michael S. Branicky_, Dec 30 2022

%H Michael S. Branicky, <a href="/A161596/a161596_1.txt">RATS Sequence Cycles</a>.

%H Curtis Cooper, <a href="http://cs.ucmo.edu/~cnc8851/rats.html">RATS</a>.

%H Curtis Cooper and Robert E. Kennedy, <a href="https://doi.org/10.1007/978-94-011-4271-7_9">Base 10 RATS Cycles and Arbitrarily Long Base 10 RATS Cycles</a>, Applications of Fibonacci numbers, Vol. 8, Kluwer Acad. Publ., Dordrecht, 1999, pages 83-93.

%H Tanya Khovanova, <a href="http://blog.tanyakhovanova.com/?p=155">Destinies of Numbers</a>.

%e a(1)=A114611(0). a(2)=A114611(j=3)=8 with a cycle of length 8 shown in A066710.

%e A114611(j=6)=8 does not contribute because the cycle is the same as reached from j=3.

%e a(3)=A114611(9)=2 with a new cycle of length 2 shown in A066711.

%e A114611(j=12)=8 does not contribute because the cycle is the same as reached from j=3.

%e A114611(j=15)=8 does not contribute because 15->66->123 is the cycle as reached from j=3.

%e A114611(j=18)=2 does not contribute because the cycle is the same as reached from j=9.

%e A114611(j=21)=8 does not contribute because 21->33->66 reaches the same cycle as started from j=3.

%e a(4)=A114611(j=29)=18.

%Y Cf. A004000, A036839, A066711, A066710, A288537.

%Y Cf. A161590, A161592, A161596.

%K more,nonn,base

%O 1,2

%A _J. H. Conway_ and _Tanya Khovanova_, Jun 14 2009

%E Comment and examples added by _R. J. Mathar_, Jul 07 2009

%E a(9)-a(14) from _Michael S. Branicky_, Dec 30 2022

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