
	 For positive integers $n$, let $S_n$ be the set of integers $x$ such that $n$ distinct lines, no three concurrent, can divide a plane into $x$ regions (for example, $S_2=\{3,4\}$, because the plane is divided into 3 regions if the two lines are parallel, and 4 regions otherwise). What is the minimum $i$ such that $S_i$ contains at least 4 elements?

1. We start by understanding the problem and the given example. For \( n = 2 \), the set \( S_2 = \{3, 4\} \) because:
   - If the two lines are parallel, they divide the plane into 3 regions.
   - If the two lines intersect, they divide the plane into 4 regions.

2. Next, we consider \( n = 3 \). We need to determine the possible number of regions formed by 3 lines:
   - If all three lines are parallel, they divide the plane into 4 regions.
   - If two lines are parallel and the third line intersects them, they divide the plane into 6 regions.
   - If no two lines are parallel and no three lines are concurrent, they divide the plane into 7 regions.

3. We need to check if it is possible to create 5 regions with 3 lines:
   - If all three lines are concurrent (intersect at a single point), they divide the plane into 6 regions.
   - Therefore, it is impossible to create exactly 5 regions with 3 lines.

4. Now, we consider \( n = 4 \). We need to determine the possible number of regions formed by 4 lines:
   - If all four lines are parallel, they divide the plane into 5 regions.
   - If three lines are parallel and the fourth line intersects them, they divide the plane into 8 regions.
   - If two pairs of lines are parallel, they divide the plane into 9 regions.
   - If no two lines are parallel and no three lines are concurrent, they divide the plane into 11 regions.

5. We need to check if it is possible to create exactly 6, 7, or 10 regions with 4 lines:
   - By carefully arranging the lines, we can create exactly 6, 7, or 10 regions.

6. Therefore, \( S_4 \) contains at least 4 elements: \( \{5, 6, 7, 8, 9, 10, 11\} \).

Conclusion:
The minimum \( i \) such that \( S_i \) contains at least 4 elements is \( \boxed{4} \).