Find all positive integers $ k$ for which the following statement is true: If $ F(x)$ is a polynomial with integer coefficients satisfying the condition $ 0 \leq F(c) \leq k$ for each $ c\in \{0,1,\ldots,k \plus{} 1\}$, then  $ F(0) \equal{} F(1) \equal{} \ldots \equal{} F(k \plus{} 1)$.
1. **Initial Setup and Condition Analysis**:
   We need to find all positive integers \( k \) such that if \( F(x) \) is a polynomial with integer coefficients satisfying \( 0 \leq F(c) \leq k \) for each \( c \in \{0, 1, \ldots, k+1\} \), then \( F(0) = F(1) = \ldots = F(k+1) \).

2. **Difference Analysis**:
   Consider the difference \( F(k+1) - F(0) \). Since \( F(x) \) has integer coefficients, \( F(k+1) - F(0) \) must be a multiple of \( k+1 \). However, given \( 0 \leq F(c) \leq k \), we have:
   \[
   |F(k+1) - F(0)| \leq k
   \]
   The only multiple of \( k+1 \) that lies within the interval \([-k, k]\) is 0. Therefore:
   \[
   F(k+1) - F(0) = 0 \implies F(k+1) = F(0)
   \]

3. **Polynomial Factorization**:
   Since \( F(k+1) = F(0) \), we can write:
   \[
   F(x) - F(0) = x(x - (k+1)) \cdot G(x)
   \]
   for some polynomial \( G(x) \) with integer coefficients. This implies:
   \[
   F(x) = F(0) + x(x - (k+1)) \cdot G(x)
   \]

4. **Bounding \( G(x) \)**:
   For \( c \in \{1, 2, \ldots, k\} \), we have:
   \[
   0 \leq F(c) \leq k \implies 0 \leq F(0) + c(c - (k+1)) \cdot G(c) \leq k
   \]
   This gives:
   \[
   |c(c - (k+1)) \cdot G(c)| \leq k
   \]
   For \( 2 \leq c \leq k-1 \), we have \( c(k+1-c) > k \). Therefore:
   \[
   |G(c)| < 1 \implies G(c) = 0
   \]

5. **Further Factorization**:
   Since \( G(c) = 0 \) for \( 2 \leq c \leq k-1 \), we can write:
   \[
   F(x) - F(0) = x(x-2)(x-3) \cdots (x-(k-1))(x-(k+1)) \cdot H(x)
   \]
   for some polynomial \( H(x) \) with integer coefficients.

6. **Checking \( H(x) \) at Specific Points**:
   We need to show \( H(1) = 0 \) and \( H(k) = 0 \). For \( c = 1 \) and \( c = k \):
   \[
   k \geq |F(c) - F(0)| = |(k-2)! \cdot k \cdot H(c)|
   \]
   If \( k \geq 4 \), then \((k-2)! > 1\), implying \( H(c) = 0 \).

7. **Conclusion for \( k \geq 4 \)**:
   If \( k \geq 4 \), then \( H(x) = 0 \), and thus \( F(x) = F(0) \) for all \( x \in \{0, 1, \ldots, k+1\} \).

8. **Checking Small Values of \( k \)**:
   - For \( k = 1 \), \( F(x) = x(2-x) \) does not satisfy the condition.
   - For \( k = 2 \), \( F(x) = x(3-x) \) does not satisfy the condition.
   - For \( k = 3 \), \( F(x) = x(4-x)(x-2)^2 \) does not satisfy the condition.

Thus, the problem holds if and only if \( k \geq 4 \).

The final answer is \( \boxed{ k \geq 4 } \)