1. Sasha thought of three natural numbers. He wrote down all the common divisors of the first two numbers, then wrote down all the common divisors of the second and third, and finally wrote down all the common divisors of the first and third. In total, 18 numbers were written down. Four of them are $-3,3,4,4$. Find the other 14 written numbers.
Answer: 1, 1, 1, 2, 2, 2, 3, 4, 6, 6, 6, 12, 12, 12. From the condition, it follows that all three thought-of numbers are multiples of 3 and 4, which means they are multiples of 12. This already gives 6 common divisors for each pair of numbers, so there are no other common divisors.