Iterate the map n -> sum of largest digit of all divisors of n; sequence gives number of steps to reach 14.
6, 5, 4, 12, 11, 3, 2, 6, 7, 7, 10, 5, 0, 1, 7, 3, 9, 8, 2, 6, 12, 5, 13, 8, 11, 3, 12, 8, 12, 5
2 seqfan posts
Tue May 22 17:30:23 CEST 2012 [seqfan] Re: A168573