OFFSET
1,2
FORMULA
Multiplicative with a(p^e) = (a(p-1)+2)^e. If n = Product p(k)^e(k) then a(n) = Product (a(p(k)-1)+2)^e(k).
CROSSREFS
KEYWORD
nonn,mult
AUTHOR
Jaroslav Krizek, Oct 18 2009
STATUS
approved