Highest point reached in trajectory of n described in A098282, or -1 if no cycle is ever reached.
1, 2, 3, 11, 5, 131212367, 11, 1910112963, 23, 131212367, 11, 131212367
2 seqfan posts
Mon Feb 9 17:10:26 CET 2009 [seqfan] Re: Rank of a prime (Collatz/Syracuse)