OFFSET
1,1
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = n + floor(n^(s/r)); the complement is given by n + floor(n^(r/s)).
EXAMPLE
The first numbers in the joint ranking are
2^r < 2^s < 3^r < 4^r < 3^s < 5^r < 4^s < 6^r, so that a(n) = (2,5,7,...).
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Sep 01 2016
STATUS
approved