[seqfan] Re: Add-if-odd sequence

Douglas McNeil mcneil at hku.hk
Sun Dec 27 09:04:02 CET 2009

I suspect the conjecture is true; I can show the minimum
counterexample has > 10^4 digits using a bit of computation and the
fact that a(n+1)-a(n) <= 9*d, where d is the number of digits of a(n).

That the number of steps to find a cycle grows so slowly makes me
think there must be a shortish pigeonhole proof, though I can't make
one work.


Department of Earth Sciences
University of Hong Kong

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