For which integers $N\ge 3$ can we find $N$ points on the plane such that no three are collinear, and for any triangle formed by three vertices of the points’ convex hull, there is exactly one point within that triangle?
1. **Understanding the Problem:**
   We need to find integers \( N \geq 3 \) such that we can place \( N \) points on the plane with no three points collinear, and for any triangle formed by three vertices of the points' convex hull, there is exactly one point within that triangle.

2. **Convex Hull and Triangulation:**
   - The convex hull must be an \( n \)-gon.
   - A triangulation of an \( n \)-gon contains \( n-2 \) triangles.
   - Each triangle must contain exactly one point inside it.
   - Therefore, the total number of points \( N \) is the sum of the vertices of the \( n \)-gon and the points inside the triangles: 
     \[
     N = n + (n-2) = 2n - 2
     \]
   - This implies \( N \) must be even, and \( N = 2n - 2 \) for some integer \( n \geq 3 \).

3. **Construction for Even \( N \geq 3 \):**
   - Consider a convex \( n \)-gon \( P \).
   - Create a zigzag (broken line) \( v_1v_2 \dots v_n \) as follows:
     - Let \( v_1 \) be any vertex of \( P \).
     - Let \( v_2 \) be its neighbor.
     - For \( i \geq 3 \), let \( v_{i+1} \) be the vertex neighboring \( v_{i-1} \) that hasn't been labeled yet.
   - This zigzag partitions \( P \) into triangles \( T_i = v_{i-1}v_iv_{i+1} \) for \( 2 \leq i \leq n-1 \).

4. **Placing Points Inside Triangles:**
   - Draw all diagonals of \( P \), splitting \( P \) into smaller polygons.
   - Place a point \( p_i \) inside each triangle \( T_i \) close to \( v_i \).
   - Ensure no three points are collinear.

5. **Verification:**
   - For any triangle \( \triangle = v_av_bv_c \) formed by three vertices of \( P \) (with \( a < b < c \)), the point \( p_b \) is inside \( \triangle \).
   - This is because \( p_i \) is placed close to \( v_i \), ensuring \( p_i \) is inside a triangle only if \( v_i \) is a vertex of that triangle.
   - Among \( p_a, p_b, p_c \), only \( p_b \) is inside \( \triangle \) because the interior of \( \triangle \) is disjoint from \( T_a \) and \( T_c \), but a small part of \( \angle v_{b-1}v_bv_{b+1} \) near \( v_b \) is within \( \triangle \).

6. **Conclusion:**
   - We have provided a construction for each \( N = 2n - 2 \) and excluded the rest.
   - Therefore, exactly the even \( N \) satisfy the conditions.

\(\blacksquare\)

The final answer is \( \boxed{ N = 2n - 2 } \) for even \( N \geq 3 \).