20210107

357_prime_generating_integers/main.go

@@ -0,0 +1,47 @@
+package main
+
+import "fmt"
+
+func main() {
+	sum := 0
+	for i := 1; i < 100000000; i++ {
+		if isCompatible(i) {
+			sum += i
+		}
+	}
+	fmt.Println("sum=", sum)
+}
+
+func isCompatible(n int) bool {
+	ds := listDivisors(n)
+	for _, i := range ds {
+		if !isPrime(i + n/i) {
+			return false
+		}
+	}
+	return true
+}
+
+func listDivisors(input int) []int {
+	var ret []int
+	for i := 1; i <= input; i++ {
+		if input%i == 0 {
+			ret = append(ret, i)
+		}
+	}
+	return ret
+}
+
+func isPrime(n int) bool {
+	if n <= 1 {
+		return false
+	}
+	divider := 2
+	for divider < n {
+		if n%divider == 0 {
+			return false
+		}
+		divider++
+	}
+	return true
+}

357_prime_generating_integers/main_test.go

@@ -0,0 +1,27 @@
+package main
+
+import "testing"
+
+func Test_isCompatible(t *testing.T) {
+	type args struct {
+		n int
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			"test1",
+			args{30},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isCompatible(tt.args.n); got != tt.want {
+				t.Errorf("isCompatible() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}