OFFSET
1,2
COMMENTS
a(n) = number of non-powerful divisors d of n where powerful numbers are numbers from A001694(m) for m >=1.
LINKS
FORMULA
EXAMPLE
For n = 12, set of such divisors is {1, 2, 3, 6, 12}; a(12) = 5.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Dec 25 2010
STATUS
approved