Simplified Pythagorean triple

PythTriple.cs

// Given int n

var soln = new List<(int a, int b, int c)>();

// Bound for a
double aMax = (1.0 - (1.0 / Math.Sqrt(2.0))) * n;

for (int a=1; a<aMax; a++)
{

    // b = (N^2 - 2Na) / (2N - 2a)
    int num = n * n - 2 * n * a;
    int denom = 2 * n - 2 * a;
    if (num % denom != 0)
    {
        continue;
    }
    int b = num / denom;

    // c = N - a - b
    int c = n - a - b;

    soln.Add((a, b, c));
}