modify MR

Author: weilycoder

cyaron/math.py

@@ -160,9 +160,7 @@ def miller_rabin(n, repeat_time=20):
         d >>= 1
         s += 1
     for _ in range(repeat_time):
-        a = 0
-        while a == 0:
-            a = random.randint(2, n)
+        a = random.randint(2, n)
         if not miller_rabin_pass(a, s, d, n):
             return False
     return True