diff --git a/exercises/armstrong-numbers/armstrong_numbers.py b/exercises/armstrong-numbers/armstrong_numbers.py
index d046e34..0b7a985 100644
--- a/exercises/armstrong-numbers/armstrong_numbers.py
+++ b/exercises/armstrong-numbers/armstrong_numbers.py
@@ -1,2 +1,10 @@
 def is_armstrong(number):
-    pass
+    str_number = str(number)
+    n_digits = len(str_number)
+    Peter = 0
+
+    for digit in str_number:
+
+        Peter += int(digit)**n_digits
+
+    return Peter == number