Selecting values in double [] arrays

I have a simple problem, but as a beginner I'm struggling to find the answer. So I would really appreciate some help. I have two double [] arrays (A and B), with 10 values. There is also a simple formula (P = A + B + temp(square)). Everything is calculated in the loop.

Here is the code:

double[] arrayA = new double[] {
        1.2 * Math.Pow(10, -3),
        1.6 * Math.Pow(10, -3),
        1.9 * Math.Pow(10, -3),
        2.2 * Math.Pow(10, -2),
        2.6 * Math.Pow(10, -2),
        3 * Math.Pow(10, -4),
        3.6 * Math.Pow(10, -4),
        4,
        0.5 * Math.Pow(10, -3),
        40,
    };

double[] arrayB = new double[] {
        3.2 * Math.Pow(10, -5),
        6.4 * Math.Pow(10, -5),
        1.2 * Math.Pow(10, -4),
        2.4 * Math.Pow(10, -4),
        4.8 * Math.Pow(10, -4),
        9.6 * Math.Pow(10, -4),
        2 * Math.Pow(10, -3),
        4 * Math.Pow(10, -3),
        8 * Math.Pow(10, -3),
        1.6 * Math.Pow(10, -2),
    };

double[] result = new double[arrayA.Length];

for (int i = 0, j = 0; i < result.Length; i++, j++)
{
    result[i] = arrayA[i] + arrayB[j] * Math.Pow(303, 2);

    Console.WriteLine("P" + (i + 1) + " =   " + result[i]);
}

Console.ReadLine();

I want to find values from both arrays, where their first numbers (firstNumber*Math.Pow(x,y)) are whole numbers. Afterward, I want to do the formula only for these elements in which the first numbers are whole. Hope this makes sense. Thank you in advance. Marko.