Let $k$ be a positive integer. Find the smallest positive integer $n$ for which there exists $k$ nonzero vectors $v_1,v_2,…,v_k$ in $\mathbb{R}^n$ such that for every pair $i,j$ of indices with $|i-j|>1$ the vectors $v_i$ and $v_j$ are orthogonal.

[i]Proposed by Alexey Balitskiy, Moscow Institute of Physics and Technology and M.I.T.[/i]
To solve this problem, we need to find the smallest positive integer \( n \) such that there exist \( k \) nonzero vectors \( v_1, v_2, \ldots, v_k \) in \( \mathbb{R}^n \) with the property that for every pair of indices \( i, j \) with \( |i-j| > 1 \), the vectors \( v_i \) and \( v_j \) are orthogonal.

1. **Understanding the Orthogonality Condition**:
   - For \( v_i \) and \( v_j \) to be orthogonal, their dot product must be zero: \( v_i \cdot v_j = 0 \).
   - The condition \( |i-j| > 1 \) means that \( v_i \) and \( v_j \) are orthogonal if they are not adjacent or the same vector.

2. **Constructing the Vectors**:
   - We need to construct \( k \) vectors in \( \mathbb{R}^n \) such that the orthogonality condition is satisfied.
   - Consider the sequence of vectors \( v_1, v_2, \ldots, v_k \). We can group these vectors in pairs such that each pair is orthogonal to all other pairs.

3. **Choosing the Vectors**:
   - One way to ensure orthogonality is to use the standard basis vectors \( e_1, e_2, \ldots, e_n \) of \( \mathbb{R}^n \).
   - We can choose \( v_1 = v_2 = e_1 \), \( v_3 = v_4 = e_2 \), and so on. This ensures that \( v_i \) and \( v_j \) are orthogonal whenever \( |i-j| > 1 \).

4. **Determining the Minimum \( n \)**:
   - To cover all \( k \) vectors, we need enough basis vectors. Each basis vector can be reused twice (for adjacent pairs).
   - Therefore, the number of basis vectors needed is \( \left\lceil \frac{k}{2} \right\rceil \).

5. **Verification**:
   - For \( k = 2m \) (even), we need \( m \) basis vectors.
   - For \( k = 2m + 1 \) (odd), we still need \( m + 1 \) basis vectors.
   - In both cases, \( n = \left\lceil \frac{k}{2} \right\rceil \) is sufficient and necessary.

Thus, the smallest positive integer \( n \) for which there exist \( k \) nonzero vectors in \( \mathbb{R}^n \) satisfying the given orthogonality condition is \( \left\lceil \frac{k}{2} \right\rceil \).

The final answer is \( \boxed{\left\lceil \frac{k}{2} \right\rceil} \).