OFFSET
1,2
EXAMPLE
5->[5/r]=2 (step 1)
2->[2r]=3 (step 2)
3->[3/r]=1->0 (steps 3 and 4),
so that a(5)=4.
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Nov 26 2010
STATUS
approved