The solution also requires some knowledge of the prime numbers up to $M$. We can use the sieve of Eratosthenes to find them, or the linear sieve for finding all primes up to some number. The final complexity is $O(N + M * \log(\log M))$ or $O(N + M)$, depending on how the sieve is implemented.

h3. -Request- Notice

h3. Request

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