Composite numbers can be used by businessmen, shopkeepers etc. These people use calculations a lot in their daily life.
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The word "sieve" in this context is used figuratively with reference to the fact that a sieve does not hold all its contents. Think of sprinkling numbers at the top of the page. The composite numbers get caught, the prime numbers sift on down.
Prime numbers are used to encrypt credit cards and identify them.
It is primarily because we have ten digits on our hands.
we have 7 days in a week. 7 is a prime number. there are 31 days in some months.31 is a prime number
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