Initial commit

2018-07-02 15:45:49 -04:00
parent 60b3954a3b
commit fd817f8811
28 changed files with 809 additions and 0 deletions
--- a/problem-35.py
+++ b/problem-35.py
@@ -0,0 +1,52 @@
+
+MAX_NUM = 1000000
+
+def is_prime(n):
+    """Returns True if n is prime."""
+    if n == 1:
+        return False
+    if n == 2:
+        return True
+    if n == 3:
+        return True
+    if n % 2 == 0:
+        return False
+    if n % 3 == 0:
+        return False
+
+    i = 5
+    w = 2
+
+    while i * i <= n:
+        if n % i == 0:
+            return False
+        i += w
+        w = 6 - w
+
+    return True
+
+
+if __name__ == '__main__':
+    results = []
+    for i in range(MAX_NUM):
+        if not is_prime(i):
+            continue
+        j = str(i)
+        if len(j) == 1:
+            if is_prime(i):
+                results.append(i)
+            continue
+        if len(j) == 2:
+            if is_prime(i) and is_prime(int(j[1] + j[0])):
+                results.append(i)
+            continue
+        for rotation in range(len(j)):
+            prime = True
+            j = j[1] + j[2:] + j[0]
+            if not is_prime(int(j)):
+                prime = False
+                break
+        if prime is True: results.append(i)
+
+    print(results)
+    print(len(results))