Question

Example 4. Let A be a set of two positive integers. Let f= A → Z be a function defined
by f(n) = P, where p is the highest prime factor of n. Suppose range of f= {3}. Find A
is
A uniquely determined ?
​

Answer 1

Answer:

be the set of two positive integers and

(set of positive integer) defined as

where p is the largest prime factor of n. If the range of

is

, find A.