If the starting function is the Möbius function itself, the list of functions is: , the Möbius function where is the unit function , the constant function , where is the number of divisors of , (see divisor function).
If the starting function is the Möbius function itself the list of functions is  the Möbius function where is the unit function  the constant function  where is the number of divisors of  (see divisor function)