4. Consider the set $M$ of integers $n \in[-50 ; 250]$, for which the expression $A=n^{3}-2 n^{2}-13 n-10$ is divisible by 13. How many integers are contained in $M$? Find the largest and smallest of them?
Answer: 1) 69 numbers; 2) $n_{\min }=-47, n_{\max }=246$.