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Tell whether each number is prime or composite or neither?

Updated: 11/10/2020
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7y ago

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In theory it is possible but in practice, if a number is a product of two very large primes - each being a hundred digits long, or larger - then it is very difficult to tell whether it is prime or composite. The fact that it is so difficult makes this characteristic particularly useful for data encryption.

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7y ago
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Q: Tell whether each number is prime or composite or neither?
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