Get rid of auxiliary function

src/project_euler_python/problems_001_050/Problem041.py

@@ -12,14 +12,6 @@ https://projecteuler.net/problem=41
 from project_euler_python.utils import is_prime, timeit
 
 
-def is_pandigital(number):
-    number = sorted(str(number))
-    check = [str(i) for i in range(1, len(number) + 1)]
-    if number == check:
-        return True
-    return False
-
-
 @timeit("Problem 041")
 def compute():
     """
@@ -30,8 +22,10 @@ def compute():
     What is the largest n-digit pandigital prime that exists?
     """
 
+    pandigital = [str(number) for number in range(1, 10)]
+
     for ans in range(7654321, 1, -1):
-        if is_pandigital(ans):
+        if sorted(str(ans)) == pandigital[: len(str(ans))]:
             if is_prime(ans):
                 return ans