euler

commit 5abc233a17fde47a3943f2c7c53b43860e3f60fb
parent d4b5c67c0367f0f779ccb79f3ea0138ea68e7987
Author: Cody Lewis <luxdotsugi@gmail.com>
Date:   Sat, 17 Nov 2018 19:35:43 +1100

Solution to problem 3

Diffstat:
A
Three.py
 | 
23
+++++++++++++++++++++++

1 file changed, 23 insertions(+), 0 deletions(-)
diff --git a/Three.py b/Three.py
@@ -0,0 +1,23 @@
+import math
+'''
+The prime factors of 13195 are 5, 7, 13 and 29.
+
+What is the largest prime factor of the number 600851475143?
+'''
+def is_prime(n):
+    for i in range(2, int(math.sqrt(n) + 1)):
+        if (n % i) == 0:
+            return False
+    return True
+
+
+def find_biggest_prime_factor(n):
+    for i in range(int(math.sqrt(n)), 1, -1):
+        if is_prime(i) and (n % i) == 0:
+            return i
+    return 1
+
+if __name__ == "__main__":
+    LIMIT = 600_851_475_143
+    print("Started calculating...")
+    print(f"The biggest prime factor of {LIMIT} is {find_biggest_prime_factor(LIMIT)}")