OFFSET
1,3
EXAMPLE
The trajectory of 15 is [15, 26, 13, 24, 12, 6, 3, 5, 8, 4, 2, 1], taking 11 steps to reach 11. So a(15) = 11.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ali Sada, Nov 13 2019
STATUS
approved