diff --git a/src/main/scala/ninetyNineScalaProblems/arithmetic/Problem33.scala b/src/main/scala/ninetyNineScalaProblems/arithmetic/Problem33.scala
new file mode 100644
index 0000000..19cbcd3
--- /dev/null
+++ b/src/main/scala/ninetyNineScalaProblems/arithmetic/Problem33.scala
@@ -0,0 +1,7 @@
+package ninetyNineScalaProblems.arithmetic
+
+import scala.annotation.tailrec
+
+object Problem33:
+    def coprime(a: Int, b: Int): Boolean =
+        Problem32.gcd(a, b) == 1
\ No newline at end of file
diff --git a/src/test/scala/ninetyNineScalaProblems/arithmetic/Problem33Suite.scala b/src/test/scala/ninetyNineScalaProblems/arithmetic/Problem33Suite.scala
new file mode 100644
index 0000000..8891c13
--- /dev/null
+++ b/src/test/scala/ninetyNineScalaProblems/arithmetic/Problem33Suite.scala
@@ -0,0 +1,22 @@
+package ninetyNineScalaProblems.arithmetic
+
+class Problem33Suite extends munit.FunSuite:
+    List(
+        ((0, 0), false),
+        ((1, 1), true),
+        ((2, 2), false),
+        ((1, 3), true),
+        ((1, 2), true),
+        ((2, 3), true),
+        ((42, 21), false),
+        ((2, 4), false),
+        ((4, 2), false),
+        ((6, 9), false),
+        ((35, 64), true),
+        ((64, 35), true),
+        ((35, 35), false),
+        ((64, 64), false),
+    ).foreach:
+        case ((a, b), expected) =>
+            test(s"coprime returns [$expected]"):
+                assertEquals(Problem33.coprime(a, b), expected)
\ No newline at end of file