Find if there are solutions : $ a,b \in\mathbb{N} $ , $a^2+b^2=2018  $  ,  $    7|a+b $ .
1. We start with the equation \(a^2 + b^2 = 2018\) and the condition \(7 \mid (a + b)\). We need to find \(a, b \in \mathbb{N}\) that satisfy both conditions.

2. First, consider the equation \(a^2 + b^2 = 2018 \pmod{7}\). The possible quadratic residues modulo 7 are \(0, 1, 2, 4\). Therefore, \(a^2 \pmod{7}\) and \(b^2 \pmod{7}\) can only be one of these values.

3. We need to find pairs \((a^2 \pmod{7}, b^2 \pmod{7})\) such that their sum is congruent to \(2018 \pmod{7}\). Calculate \(2018 \pmod{7}\):
   \[
   2018 \div 7 = 288 \text{ remainder } 2 \implies 2018 \equiv 2 \pmod{7}
   \]
   So, we need \(a^2 + b^2 \equiv 2 \pmod{7}\).

4. Check all possible pairs of quadratic residues modulo 7:
   \[
   \begin{aligned}
   &0 + 0 \equiv 0 \pmod{7} \\
   &0 + 1 \equiv 1 \pmod{7} \\
   &0 + 2 \equiv 2 \pmod{7} \\
   &0 + 4 \equiv 4 \pmod{7} \\
   &1 + 1 \equiv 2 \pmod{7} \\
   &1 + 2 \equiv 3 \pmod{7} \\
   &1 + 4 \equiv 5 \pmod{7} \\
   &2 + 2 \equiv 4 \pmod{7} \\
   &2 + 4 \equiv 6 \pmod{7} \\
   &4 + 4 \equiv 1 \pmod{7}
   \end{aligned}
   \]
   The pairs \((a^2 \pmod{7}, b^2 \pmod{7})\) that sum to 2 are \((0, 2)\) and \((1, 1)\).

5. Now, consider the condition \(7 \mid (a + b)\). This means \(a + b \equiv 0 \pmod{7}\).

6. For the pair \((a^2 \equiv 1 \pmod{7}, b^2 \equiv 1 \pmod{7})\), \(a\) and \(b\) can be \(1\) or \(6 \pmod{7}\). Therefore, the possible values are:
   \[
   \begin{aligned}
   &a \equiv 1 \pmod{7}, b \equiv 6 \pmod{7} \\
   &a \equiv 6 \pmod{7}, b \equiv 1 \pmod{7}
   \end{aligned}
   \]

7. For the pair \((a^2 \equiv 0 \pmod{7}, b^2 \equiv 2 \pmod{7})\), there are no integer solutions since 2 is not a quadratic residue modulo 7.

8. Now, we need to find specific values of \(a\) and \(b\) that satisfy these conditions. We can try:
   \[
   \begin{aligned}
   &a = 7k + 1, b = 7m + 6 \\
   &a = 7k + 6, b = 7m + 1
   \end{aligned}
   \]
   and check if \(a^2 + b^2 = 2018\).

9. Trying \(a = 43\) and \(b = 13\):
   \[
   43^2 + 13^2 = 1849 + 169 = 2018
   \]
   This satisfies the equation \(a^2 + b^2 = 2018\) and \(a + b = 56\), which is divisible by 7.

10. Similarly, \(a = 13\) and \(b = 43\) also works.

The final answer is \( \boxed{ (a, b) = (43, 13) } \) or \((13, 43)\).