For every point on the plane, one of $ n$ colors are colored to it such that:

$ (1)$ Every color is used infinitely many times.

$ (2)$ There exists one line such that all points on this lines are colored exactly by one of two colors.

Find the least value of $ n$ such that there exist four concyclic points with pairwise distinct colors.
To solve the problem, we need to find the smallest value of \( n \) such that there exist four concyclic points with pairwise distinct colors, given the conditions:
1. Every color is used infinitely many times.
2. There exists one line such that all points on this line are colored exactly by one of two colors.

Let's analyze the problem step-by-step.

1. **Initial Observation:**
   - Clearly, \( n \geq 4 \). If \( n < 4 \), it is impossible to have four points with distinct colors.

2. **Case \( n = 4 \):**
   - Assume the colors are labeled \( 1, 2, 3, 4 \).
   - Consider a circle \(\Gamma\) and three points \( A, B, C \) on \(\Gamma\).
   - Color the points on arc \( AB \) (including \( A \) but not \( B \)) with color \( 1 \).
   - Color the points on arc \( BC \) (including \( B \) but not \( C \)) with color \( 2 \).
   - Color the points on arc \( CA \) (including \( C \) but not \( A \)) with color \( 3 \).
   - Color all other points on the plane with color \( 4 \).
   - This satisfies both conditions, but the only circle containing points with colors \( 1, 2, 3 \) does not contain a point with color \( 4 \).
   - Thus, \( n \neq 4 \), so \( n \geq 5 \).

3. **Case \( n = 5 \):**
   - Assume the colors are labeled \( 1, 2, 3, 4, 5 \).
   - From condition (2), there exists a line \(\ell\) such that all points on it are of only two colors. Assume these colors are \( 1 \) and \( 2 \).
   - From condition (1), there exist points \( A, B, C \notin \ell \) with colors \( 3, 4, 5 \) respectively.
   - If \( A, B, C \) are not collinear, let \(\Gamma\) be the circle passing through points \( A, B, C \).

4. **Intersection Analysis:**
   - If \(\Gamma\) intersects \(\ell\), then there are 4 concyclic points of different colors, and we are done.
   - If \(\Gamma\) and \(\ell\) do not intersect, but there is a point colored \( 1 \) or \( 2 \) on \(\Gamma\), then there are 4 concyclic points of different colors, and we are done.
   - If \(\Gamma\) and \(\ell\) do not intersect, and there are no points with colors \( 1 \) or \( 2 \) on \(\Gamma\), i.e., all points on \(\Gamma\) are colored \( 3, 4, 5 \):
     - Let \( O \) be the center of \(\Gamma\).
     - Let \( D \) be the point on \(\ell\) such that \( OD \perp \ell \). Assume \( D \) has color \( 1 \).
     - Let \( E \) be a point on \(\ell\) with color \( 2 \).
     - Let line \( OD \) intersect \(\Gamma\) at \( P \) and \( Q \), where \( P \) is closer to \(\ell\) than \( Q \).
     - Let \( QE \) intersect \(\Gamma\) at \( R \). Assume \( P \) has color \( 3 \).
     - If \( R \) is not colored \( 3 \), then since \(\angle ERP = \angle EDP = 90^\circ\), \( E, R, P, D \) are concyclic, and we are done.
     - If \( R \) has color \( 3 \), let \( QB \) intersect \(\ell\) at \( F \). Assume \( B \) has color \( 4 \).
     - If \( F \) has color \( 2 \), then since \(\angle PBF = \angle PDF = 90^\circ\), \( P, B, F, D \) are concyclic, and we are done.
     - If \( F \) has color \( 1 \), then since \( QR \cdot QE = QP \cdot QD = QB \cdot QF \), \( E, R, B, F \) are concyclic, and we are done.

5. **Line Analysis:**
   - If all points colored \( 3, 4, 5 \) lie on only one line, let that line be \(\ell'\).
   - Call a point on \(\ell'\) *good* if its color is \( 3, 4 \) or \( 5 \).
   - Let \( X \) and \( Y \) be points on \(\ell\) (and not on \(\ell'\)) colored \( 1 \) and \( 2 \) respectively.
   - Let \( P_1, P_2, P_3 \) (in order from left to right) be good points on \(\ell'\) with different colors. Assume the colors of \( P_1, P_2, P_3 \) are \( 3, 4, 5 \) respectively.

6. **Case Analysis:**
   - **Case 1:** There exists a good point \( P_4 \) not colored \( 4 \) either to the left of \( P_1 \) or to the right of \( P_3 \).
     - Circles \((P_1P_3X)\) and \((P_2P_4Y)\) intersect and each have at least 3 distinct colors.
     - Assuming \( Y \notin (P_1P_3X) \), an intersection point of those two circles is either colored \( 1 \) or \( 2 \). Thus, one of those two circles will have 4 distinct colors, and we are done.
   - **Case 2:** All good points to the left of \( P_1 \) or to the right of \( P_3 \) (if there are any) are colored \( 4 \).
     - From condition (1), there exist points \( P_5 \) and \( P_6 \), both between \( P_1 \) and \( P_3 \), whose colors are \( 3 \) and \( 5 \) respectively.
     - If \( P_5 \) is to the left of \( P_6 \), then \((P_1P_6X)\) and \((P_3P_5Y)\) intersect and each have at least 3 distinct colors. This shows there is a circle with 4 distinct colors.
     - If \( P_5 \) is to the right of \( P_6 \), then we have the following subcases:
       - **Case 2a:** \( P_2 \) is to the left of \( P_6 \).
         - \((P_1P_6X)\) and \((P_2P_3Y)\) intersect and each have at least 3 distinct colors. This shows there is a circle with 4 distinct colors.
       - **Case 2b:** \( P_2 \) is between \( P_6 \) and \( P_5 \).
         - \((P_1P_2X)\) and \((P_5P_6Y)\) intersect and each have at least 3 distinct colors. This shows there is a circle with 4 distinct colors.
       - **Case 2c:** \( P_2 \) is to the right of \( P_5 \).
         - \((P_1P_2X)\) and \((P_3P_5Y)\) intersect and each have at least 3 distinct colors. This shows there is a circle with 4 distinct colors.

In all cases, we have shown that there is a circle with 4 distinct colors for \( n = 5 \), and we are done.

The final answer is \( \boxed{ n = 5 } \).