diff --git a/riemann/divisor.go b/riemann/divisor.go
new file mode 100644
index 0000000..e99a063
--- /dev/null
+++ b/riemann/divisor.go
@@ -0,0 +1,5 @@
+package riemann
+
+func DivisorSum(n int) int {
+	return 0
+}
diff --git a/riemann/divisor_test.go b/riemann/divisor_test.go
new file mode 100644
index 0000000..5467bf0
--- /dev/null
+++ b/riemann/divisor_test.go
@@ -0,0 +1,14 @@
+package riemann
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestDivisorSum(t *testing.T) {
+	sum := DivisorSum(192)
+	fmt.Println(sum)
+	if sum != 72 {
+		t.Fatal("Divisor sum doesn't match!")
+	}
+}