1. Find any four different natural numbers that have the following property: if the product of any two of them is added to the product of the other two numbers, the result is a prime number.
1. For example, the numbers $1,2,3$ and 5 will work. Indeed, the values of all three expressions $1 \cdot 2+3 \cdot 5=17,1 \cdot 3+2 \cdot 5=13$ and $1 \cdot 5+2 \cdot 3=11$ are prime numbers.