At 05:41 AM 6/8/2003, y.kohmoto wrote: %N A000001 a(n) is the greatest prime factor of 3*a(n-1)+2 . > I conjectured as follows : > "for all number m, if a(1)=m then the sequence becomes cyclic." > > Is there any counter example? A quick test shows it holds to 2,120,000 (at least).