OFFSET
1,3
COMMENTS
a(n) = A070167(n) for n >= 5.
a(n) = n if 3 divides n.
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, E16.
LINKS
EXAMPLE
For n=8,
the trajectory of 1 is 1, 4, 2, 1, 4, ... (8 does not appear), and
the trajectory of 2 is 2, 1, 4, 2, 1, ... (8 does not appear), but
the trajectory of 3 is 3, 10, 5, 16, 8, ... (8 does appear),
so a(8) = 3.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ethan E. Wood, May 13 2024
EXTENSIONS
Edited by Jon E. Schoenfield, May 13 2024
STATUS
approved