For a fixed integer $n\geqslant2$ consider the sequence $a_k=\text{lcm}(k,k+1,\ldots,k+(n-1))$. Find all $n$ for which the sequence $a_k$ increases starting from some number.
1. **Case for \( n = 2 \):**
   - For \( n = 2 \), the sequence \( a_k = \text{lcm}(k, k+1) \).
   - Since \( k \) and \( k+1 \) are consecutive integers, they are coprime. Therefore, \( \text{lcm}(k, k+1) = k(k+1) \).
   - As \( k \) increases, \( k(k+1) \) also increases. Hence, for \( n = 2 \), the sequence \( a_k \) is increasing.

2. **Case for \( n \geq 3 \):**
   - Let \( p \) be a prime factor of \( n-1 \).
   - Choose \( k \) such that \( k > n \) and \( k \equiv -n \pmod{p} \) and \( k \equiv 1 \pmod{q} \) for all \( q < n \) and \( q \neq p \).
   - This ensures that \( \gcd(k, (n-1)!) = 1 \), meaning \( k \) is coprime with the factorial of \( n-1 \).
   - As \( k \to \infty \), consider the sequence \( a_{k+1} = \text{lcm}(k+1, k+2, \ldots, k+n) \).

3. **Inequality Analysis:**
   - We have:
     \[
     a_{k+1} = \text{lcm}(k+1, k+2, \ldots, k+n) \leq \text{lcm}(k+1, k+2, \ldots, k+n-1) \cdot \frac{k+n}{p}
     \]
   - Since \( \frac{k+n}{p} \leq \frac{k+n}{2} \) (because \( p \) is a prime factor of \( n-1 \) and \( p \geq 2 \)), we get:
     \[
     a_{k+1} \leq \text{lcm}(k+1, k+2, \ldots, k+n-1) \cdot \frac{k+n}{2}
     \]
   - Notice that:
     \[
     \text{lcm}(k+1, k+2, \ldots, k+n-1) \cdot \frac{k+n}{2} < k \cdot \text{lcm}(k+1, k+2, \ldots, k+n-1)
     \]
   - Therefore:
     \[
     a_{k+1} < a_k
     \]

4. **Conclusion:**
   - For \( n \geq 3 \), the sequence \( a_k \) is not ultimately increasing because there exist values of \( k \) such that \( a_{k+1} < a_k \).

The final answer is \( \boxed{ n = 2 } \).