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There are two pairs of prime numbers that express 18 as the sum of two prime numbers: 7 + 11 = 18 and 5 + 13 = 18.

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2,3,6

Q: How many pairs of prime numbers are there to express 18 as the sum of two prime numbers?

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420 has four prime factors. Prime factors don't usually travel in pairs.

There are 35 pairs of twin prime numbers totaling 69 numbers (prime number 5 appears twice in the twin pairs) between 0 and 1000.

One. 997 and 2

Eight pairs.

There are 3 pairs of prime numbers with sum of 36. These are: (31, 5), (29, 7), (23, 13), & (19, 17) Hope this helps! :D

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There are three pairs.

43

420 has four prime factors. Prime factors don't usually travel in pairs.

6

There are 35 pairs of twin prime numbers totaling 69 numbers (prime number 5 appears twice in the twin pairs) between 0 and 1000.

41,2

7

One. 997 and 2

Eight pairs.

Just 3 + 3

Only one pair.

There are 3 pairs of prime numbers with sum of 36. These are: (31, 5), (29, 7), (23, 13), & (19, 17) Hope this helps! :D