Determine the maximal possible length of the sequence of consecutive integers which are expressible in the form $ x^3\plus{}2y^2$, with $ x, y$ being integers.
To determine the maximal possible length of the sequence of consecutive integers which are expressible in the form \( x^3 + 2y^2 \), where \( x \) and \( y \) are integers, we need to analyze the possible values of \( x^3 + 2y^2 \) modulo 8.

1. **Analyze \( x^3 \mod 8 \):**
   - If \( x \equiv 0 \pmod{8} \), then \( x^3 \equiv 0 \pmod{8} \).
   - If \( x \equiv 1 \pmod{8} \), then \( x^3 \equiv 1 \pmod{8} \).
   - If \( x \equiv 2 \pmod{8} \), then \( x^3 \equiv 8 \equiv 0 \pmod{8} \).
   - If \( x \equiv 3 \pmod{8} \), then \( x^3 \equiv 27 \equiv 3 \pmod{8} \).
   - If \( x \equiv 4 \pmod{8} \), then \( x^3 \equiv 64 \equiv 0 \pmod{8} \).
   - If \( x \equiv 5 \pmod{8} \), then \( x^3 \equiv 125 \equiv 5 \pmod{8} \).
   - If \( x \equiv 6 \pmod{8} \), then \( x^3 \equiv 216 \equiv 0 \pmod{8} \).
   - If \( x \equiv 7 \pmod{8} \), then \( x^3 \equiv 343 \equiv 7 \pmod{8} \).

   Therefore, \( x^3 \mod 8 \) can be \( 0, 1, 3, 5, 7 \).

2. **Analyze \( 2y^2 \mod 8 \):**
   - If \( y \equiv 0 \pmod{4} \), then \( 2y^2 \equiv 0 \pmod{8} \).
   - If \( y \equiv 1 \pmod{4} \), then \( 2y^2 \equiv 2 \pmod{8} \).
   - If \( y \equiv 2 \pmod{4} \), then \( 2y^2 \equiv 8 \equiv 0 \pmod{8} \).
   - If \( y \equiv 3 \pmod{4} \), then \( 2y^2 \equiv 18 \equiv 2 \pmod{8} \).

   Therefore, \( 2y^2 \mod 8 \) can be \( 0, 2 \).

3. **Combine \( x^3 \) and \( 2y^2 \) modulo 8:**
   - Possible values of \( x^3 + 2y^2 \mod 8 \) are \( 0, 1, 2, 3, 5, 7 \).

   Notice that \( 4 \) and \( 6 \) are missing from the list of possible values.

4. **Conclusion:**
   - Since \( 4 \) and \( 6 \) cannot be expressed in the form \( x^3 + 2y^2 \), any sequence of consecutive integers containing either \( 4 \) or \( 6 \) cannot be fully expressible in this form.
   - The longest sequence of consecutive integers that avoids \( 4 \) and \( 6 \) is of length 5. For example, the sequence \(-1, 0, 1, 2, 3\) can be expressed as:
     - \(-1 = (-1)^3 + 2(0)^2\)
     - \(0 = 0^3 + 2(0)^2\)
     - \(1 = 1^3 + 2(0)^2\)
     - \(2 = 0^3 + 2(1)^2\)
     - \(3 = 1^3 + 2(1)^2\)

Therefore, the maximal possible length of the sequence of consecutive integers expressible in the form \( x^3 + 2y^2 \) is 5.

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