Find all positive integers $a$, $b$ and $c$ such that $ab$ is a square, and
\[a+b+c-3\sqrt[3]{abc}=1.\]

[i]Proposed by usjl[/i]
To find all positive integers \(a\), \(b\), and \(c\) such that \(ab\) is a square and 
\[a + b + c - 3\sqrt[3]{abc} = 1,\]
we will proceed as follows:

1. **Express \(ab\) as a square:**
   Since \(ab\) is a square, we can write \(ab = k_1^2\) for some positive integer \(k_1\).

2. **Express \(c\) in terms of \(k_1\) and another integer \(k_2\):**
   Let \(c = \frac{k_2^3}{k_1^2}\) for some positive integer \(k_2\). This ensures that \(abc\) is a perfect cube.

3. **Substitute into the given equation:**
   Substitute \(a + b + c\) and \(3\sqrt[3]{abc}\) into the equation:
   \[a + b + \frac{k_2^3}{k_1^2} - 3k_2 = 1.\]

4. **Simplify the inequality:**
   Since \(a + b \geq 2k_1\) (by the arithmetic mean-geometric mean inequality), we have:
   \[a + b + \frac{k_2^3}{k_1^2} \geq 2k_1 + \frac{k_2^3}{k_1^2}.\]
   Therefore,
   \[2k_1 + \frac{k_2^3}{k_1^2} \leq 3k_2 + 1.\]

5. **Case 1: \(2k_1 + \frac{k_2^3}{k_1^2} = 3k_2 + 1\):**
   Let \(k_2 = k_1 + d\). Then,
   \[2k_1 + \frac{(k_1 + d)^3}{k_1^2} = 3(k_1 + d) + 1.\]
   Simplifying,
   \[2k_1 + \frac{k_1^3 + 3k_1^2d + 3k_1d^2 + d^3}{k_1^2} = 3k_1 + 3d + 1.\]
   \[2k_1 + k_1 + 3d + \frac{3k_1d^2 + d^3}{k_1^2} = 3k_1 + 3d + 1.\]
   \[\frac{3k_1d^2 + d^3}{k_1^2} = 1.\]
   Let \(h = \frac{k_1}{d}\). Then,
   \[h^2 = 3h + 1.\]
   Solving this quadratic equation,
   \[h^2 - 3h - 1 = 0.\]
   The discriminant is \(9 + 4 = 13\), which is not a perfect square, so \(h\) is not an integer. Thus, there are no solutions in this case.

6. **Case 2: \(2k_1 + \frac{k_2^3}{k_1^2} = 3k_2\):**
   Let \(k_2 = k_1\). Then,
   \[2k_1 + \frac{k_1^3}{k_1^2} = 3k_1.\]
   Simplifying,
   \[2k_1 + k_1 = 3k_1.\]
   This holds true. So, \(k_2 = k_1 = k\).

7. **Substitute back to find \(a\), \(b\), and \(c\):**
   Since \(ab = k^2\) and \(c = k\), we have:
   \[a + b + k - 3k = 1.\]
   \[a + b = 2k + 1.\]
   Let \(a = k - d\) and \(b = k + d + 1\). Then,
   \[a = k - d,\]
   \[b = k + d + 1.\]
   \[a + b = (k - d) + (k + d + 1) = 2k + 1.\]
   This implies \(k = d(d + 1)\).

8. **Conclusion:**
   The only solution is:
   \[(a, b, c) = (d^2, d^2 + 2d + 1, d^2 + d) \text{ for all } d \in \mathbb{N}.\]

The final answer is \( \boxed{ (a, b, c) = (d^2, d^2 + 2d + 1, d^2 + d) \text{ for all } d \in \mathbb{N} } \).