diff --git a/src/problems/21_nth.clj b/src/problems/21_nth.clj
new file mode 100644
index 0000000..feaa676
--- /dev/null
+++ b/src/problems/21_nth.clj
@@ -0,0 +1,15 @@
+(ns problems.21-nth)
+
+(defn get-nth [n i]
+  (loop [[head & tail] n index i]
+    (if (= index 0)
+      head
+      (recur tail (dec index)))))
+
+(= (get-nth '(4 5 6 7) 2) 6)
+
+(= (get-nth [:a :b :c] 0) :a)
+
+(= (get-nth [1 2 3 4] 1) 2)
+
+(= (get-nth '([1 2] [3 4] [5 6]) 2) [5 6])
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