OFFSET
1,1
COMMENTS
Self-inverse permutation of the natural numbers.
REFERENCES
LINKS
FORMULA
a(n) = [n/3] if this is positive and new, otherwise a(n)=3n.
EXAMPLE
a(1) = 1*3 because [1/3] is not positive.
a(2) = 2*3 because [2/3] is not positive.
a(3) = 1 = [3*(1/3)].
a(4) = 4*3 because [4/3] = a(3), not new.
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jun 11 2006
STATUS
approved