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import math
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highest_factor = 1
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for x in range(3, int(math.sqrt(600851475143)), 2):
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if 600851475143 % x == 0:
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prime = True
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i = 3
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while i * i < x:
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if x % i == 0:
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prime = False # found a factor, not prime
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break
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else:
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i += 2
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if prime:
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highest_factor = x
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print(highest_factor) |
