3 and 17, as well as 7 and 13.
1 + 19
3 + 17
7 + 13
3 and 17
-20
All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.
3 + 17 = 20
They are: 2+7+11 = 20
17 and 3 are two prime numbers whose sum is 20. Their product is 51.
3 and 17
(2,3) and (2,5) are the two pairs such that the sum of their elements is a prime number.
-20
13 + 7 1 + 193 + 17
2 + 3 = 5
The largest prime less than 20 is 19. The largest prime over 60 is 61. The sum of these two numbers is 80.
It is 75.
148
All prime numbers greater than 2 are odd numbers. For an odd prime to be written as the sum of two primes, one of the primes must be 2 because two odd primes will produce an even sum. 11 cannot be written as the sum of two primes. 13 = 2 + 11. 17 cannot be written as the sum of two primes. 19 = 2 + 17.
3 + 17 = 20
They are: 2+7+11 = 20