1. It is known that the natural number $n$ is divisible by 3 and 4. Find all such possible $n$, if it is known that the number of all its divisors (including 1 and $n$) is 15? If there are several possible values, list them in any order separated by a semicolon.
Answer: 144,324 || 144; 324 || 324; 144 || 324, 144