OFFSET
1,6
LINKS
FORMULA
EXAMPLE
For n = 12, set of such divisors is {2, 3, 6, 12}; a(12) = 4.
PROG
(PARI)
A091050(n) = (1+ sumdiv(n, d, ispower(d)>1)); \\ This function from Michel Marcus, Sep 21 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Dec 25 2010
STATUS
approved