diff --git a/generate_numbers.py b/generate_numbers.py
index bef48ad..1838df0 100644
--- a/generate_numbers.py
+++ b/generate_numbers.py
@@ -1,12 +1,29 @@
 def natural_numbers(n):
     #Returns the list of natural numbers
-    #Code here
+    return list(range(1, n + 1))
 
 
 def nth_fibonacci(n):
     #Returns n-th fibonacci number
-    #Code here
+    if n <= 0:
+        return 0
+    elif n == 1:
+        return 1
+    else:
+        a, b = 0, 1
+        for _ in range(2, n + 1):
+            a, b = b, a + b
+        return b
 
 def is_prime(n):
     #Return true if 'n' is prime, otherwise returns false
-    #Code here
\ No newline at end of file
+    if n < 2:
+        return False
+    if n == 2:
+        return True
+    if n % 2 == 0:
+        return False
+    for i in range(3, int(n**0.5) + 1, 2):
+        if n % i == 0:
+            return False
+    return True
\ No newline at end of file