(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.
2 + 3 = 5
13 & 7
31.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.
2 + 3 = 5
13 & 7
Not always as for example 20+9 = 29 which is a prime number
111 + 1 = 2
31.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
3 and 17
There is only one prime number and it is '2' You cannot have any other even prime number
17
The largest prime less than 20 is 19. The largest prime over 60 is 61. The sum of these two numbers is 80.
17