diff --git a/problems/001_problem.py b/problems/001_problem.py
old mode 100644
new mode 100755
index ea7a4c7..c052179
--- a/problems/001_problem.py
+++ b/problems/001_problem.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 
 #  Problem 1:
 #  
diff --git a/problems/002_problem.py b/problems/002_problem.py
old mode 100644
new mode 100755
index 882de22..35e7a95
--- a/problems/002_problem.py
+++ b/problems/002_problem.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 
 #  Problem 2:
 #  
diff --git a/problems/003_problem.py b/problems/003_problem.py
old mode 100644
new mode 100755
index 3fe3c7e..21ac8e5
--- a/problems/003_problem.py
+++ b/problems/003_problem.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 
 #  Problem 3:
 #
diff --git a/problems/004_problem.py b/problems/004_problem.py
old mode 100644
new mode 100755
index b3e111e..8375f90
--- a/problems/004_problem.py
+++ b/problems/004_problem.py
@@ -1,5 +1,6 @@
+#!/usr/bin/env python
 
-#  Problem 3:
+#  Problem 4:
 #
 #  A palindromic number reads the same both ways. 
 #  The largest palindrome made from the product