Problem. The sum of two consecutive squares can be a square; for instance $3^2 + 4^2 = 5^2$.

(a) Prove that the sum of $m$ consecutive squares cannot be a square for $m \in \{3, 4, 5, 6\}$.
(b) Find an example of eleven consecutive squares whose sum is a square.

Can anyone help me with this? 
Thanks.
### Part (a): Prove that the sum of \( m \) consecutive squares cannot be a square for \( m \in \{3, 4, 5, 6\} \).

1. **Case \( m = 3 \):**
   \[
   n^2 + (n+1)^2 + (n+2)^2 = n^2 + (n^2 + 2n + 1) + (n^2 + 4n + 4) = 3n^2 + 6n + 5
   \]
   We need to show that \( 3n^2 + 6n + 5 \) is never a perfect square. Consider modulo 3:
   \[
   3n^2 + 6n + 5 \equiv 2 \pmod{3}
   \]
   Since 2 is not a quadratic residue modulo 3, \( 3n^2 + 6n + 5 \) cannot be a perfect square.

2. **Case \( m = 4 \):**
   \[
   n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 = n^2 + (n^2 + 2n + 1) + (n^2 + 4n + 4) + (n^2 + 6n + 9) = 4n^2 + 12n + 14
   \]
   We need to show that \( 4n^2 + 12n + 14 \) is never a perfect square. Consider modulo 4:
   \[
   4n^2 + 12n + 14 \equiv 2 \pmod{4}
   \]
   Since 2 is not a quadratic residue modulo 4, \( 4n^2 + 12n + 14 \) cannot be a perfect square.

3. **Case \( m = 5 \):**
   \[
   n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 = n^2 + (n^2 + 2n + 1) + (n^2 + 4n + 4) + (n^2 + 6n + 9) + (n^2 + 8n + 16) = 5n^2 + 20n + 30
   \]
   We need to show that \( 5n^2 + 20n + 30 \) is never a perfect square. Consider modulo 5:
   \[
   5n^2 + 20n + 30 \equiv 0 \pmod{5}
   \]
   Since \( 5n^2 + 20n + 30 \equiv 0 \pmod{5} \) but not divisible by \( 25 \), it cannot be a perfect square.

4. **Case \( m = 6 \):**
   \[
   n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 + (n+5)^2 = n^2 + (n^2 + 2n + 1) + (n^2 + 4n + 4) + (n^2 + 6n + 9) + (n^2 + 8n + 16) + (n^2 + 10n + 25) = 6n^2 + 30n + 55
   \]
   We need to show that \( 6n^2 + 30n + 55 \) is never a perfect square. Consider modulo 4:
   \[
   6n^2 + 30n + 55 \equiv 3 \pmod{4}
   \]
   Since 3 is not a quadratic residue modulo 4, \( 6n^2 + 30n + 55 \) cannot be a perfect square.

### Part (b): Find an example of eleven consecutive squares whose sum is a square.

1. **Sum of eleven consecutive squares:**
   \[
   \sum_{k=0}^{10} (n+k)^2 = 11n^2 + 110n + 385
   \]
   We need to find \( n \) such that \( 11n^2 + 110n + 385 \) is a perfect square. Let:
   \[
   11n^2 + 110n + 385 = m^2
   \]
   Dividing both sides by 11:
   \[
   n^2 + 10n + 35 = \frac{m^2}{11}
   \]
   Let \( m = 11p \):
   \[
   n^2 + 10n + 35 = 11p^2
   \]
   Completing the square:
   \[
   (n+5)^2 - 25 + 35 = 11p^2 \implies (n+5)^2 + 10 = 11p^2
   \]
   Solving the Pell's equation \( x^2 - 11y^2 = -10 \):
   \[
   (x, y) = (23, 7)
   \]
   Thus, \( n+5 = 23 \) and \( p = 7 \):
   \[
   n = 18
   \]
   Therefore, the eleven consecutive squares starting from \( 18^2 \) to \( 28^2 \) sum to \( 77^2 \).

The final answer is \( \boxed{ 18^2 + 19^2 + \ldots + 28^2 = 77^2 } \)