diff --git a/t07numberpatterns_powers3.py b/t07numberpatterns_powers3.py
index 5a37548..f716283 100644
--- a/t07numberpatterns_powers3.py
+++ b/t07numberpatterns_powers3.py
@@ -1,8 +1,9 @@
 # Generate powers of 3 from 1 to 13
 
-START = 
-END = 
-num = 
+START = 1
+END =  13
+num = 3
 
 for i in range(START, END+1):
-    print(, end=' ')
+    if num**i <= END:
+        print(num**i, end='')