Created
January 28, 2015 10:34
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| def is_prime(n): | |
| if n <= 3: | |
| return n >= 2 | |
| if n % 2 == 0 or n % 3 == 0: | |
| return False | |
| for i in range(5, int(n ** 0.5) + 1, 6): | |
| if n % i == 0 or n % (i + 2) == 0: | |
| return False | |
| return True |
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