5 + 23 = 28
or
11 + 17 = 28
5 + 23 = 28
or
11 + 17 = 28
5 + 23 = 28
or
11 + 17 = 28
5 + 23 = 28
or
11 + 17 = 28
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You can't write that as the sum of two prime numbers. Note: Goldbach's Conjecture (for expressing numbers as the sum of two prime numbers) applies to EVEN numbers.
2 + 23 = 25
It is simply: 3+23 = 26 because 3 and 23 are prime numbers
The sum of any two prime numbers may or may not be prime. The sum of the two prime numbers 2 and 3 is the prime number 5, and the sum of the two prime numbers 5 and 7 is the composite number 12.
The sum of the two prime numbers 3 and 73 is 76.