## Sum of two cousins

*Difficulty level:*

The number 10 can be written in two ways as a sum of two prime numbers:

10 = 5 + 5

and

10 = 7 + 3

How many ways can the number 549 be written as a sum of two prime numbers?

*Difficulty level:*

The number 10 can be written in two ways as a sum of two prime numbers:

10 = 5 + 5

and

10 = 7 + 3

How many ways can the number 549 be written as a sum of two prime numbers?