1) Draw a circle.

2) Pick a c value which is the sum of squares (c values where e=1,4,9,16,25..)

3) Set the radius of the circle equal to the square root of c (this calculation includes decimals).

4) Every integer point the circle passes through will be a valid sum of squares that makes c. (e.g the circle for sqrt(145) passes through (12,1) and 145 = 12^2 + 1^2)

A c example equal to the sum of squares was chosen for a reason.

This is because the formula for a circle reduces to the sum of squares when the circle's centerpoint exists at the origin (a and b in the formula = 0). The cell where e and n = 0 also functions as an origin.

https:// en.wikipedia.org/wiki/Fermat%27s_theorem_on_sums_of_two_squares