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2 and 5 are one such pair.

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Q: What are the pairs of prime numbers where their sum and difference are also prime numbers?
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What are Write three pairs of prime numbers such that sum of each pair is also a prime number?


What are two prime numbers less than 20 who's sum is also a prime number?

(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.

How do you change whole numbers to prime numbers?

You don't. All prime numbers are also whole numbers.

What numbers are prime but also even?

There are no other prime numbers that are even but 2.

Are there any 2 numbers that don't have a common factor?

Since 1, known as the "multiplicative identity", cannot be counted as a factor, there are many pairs of numbers that do not have common factors, such as 2 and 3, 2 and 5, and 3 and 5. There are many pairs of composite (not prime) numbers without common factors, such as 4 and 9. Also, since prime numbers do not have factors, any pair of primes cannot have a common factor, though a pair in which one number is prime may, e.g. 5 and 10.

Are there infinitely many natural numbers that are not prime?

This can be an extension to the proof that there are infinitely many prime numbers. If there are infinitely many prime numbers, then there are also infinitely many PRODUCTS of prime numbers. Those numbers that are the product of 2 or more prime numbers are not prime numbers.

What are even numbers that are also prime numbers?

The only even prime number is 2.

What are mirror prime numbers?

They are prime numbers when you reverse the first one, the second one is prime also.

Are most prime numbers also odd numbers?

All prime numbers are odd numbers. If one were even, it would be divisible by two and would, therefore, not be prime.

Why is the product of two prime numbers also prime?

It's not.

What is it called when the product of a pair of numbers is the LCM also?

The numbers are relatively prime, or co-prime.

Are 2 and 3 relatively prime numbers?

Yes. In general, if you have two different prime numbers, they will also be relatively prime.