Largest k such that 2^k appears in the trajectory of the Collatz 3x+1 sequence started at n.
0, 1, 4, 2, 4, 4, 4, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4
2 seqfan posts
Wed Aug 18 20:41:17 CEST 2010 [seqfan] Re: A135282: We can go ahead and change "seems" to "is known"