const MAX = 500 * 500 / 8

var factors = genFactors(MAX)

			fact := factors((r * r) / 2)

			fact := factors[(r*r)/2]

func factors(input int) []int {
	var factor []int
	for i := 1; i < input/2+1; i++ {
		if input%i == 0 {
			factor = append(factor, i)

// https://www.geeksforgeeks.org/find-all-divisors-of-first-n-natural-numbers
func genFactors(max int) map[int][]int {
	var factors = make(map[int][]int)
	for i := 1; i < max; i++ {
		for j := i; j < max; j += i {
			factors[j] = append(factors[j], i)

	factor = append(factor, input)
	return factor

	return factors