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def is_prime(n: int) -> bool:
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"""
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>>> is_prime(10)
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True
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>>> is_prime(17)
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True
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>>> is_prime(21)
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False
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"""
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for el in range(2, n):
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if n % el == 0:
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return False
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return True
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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