2,3,5,7,11...
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The missing number is 5. They're the first five prime numbers.
The two prime numbers that add up to 19 are 7 and 12. Prime numbers are numbers greater than 1 that can only be divided by 1 and themselves. In this case, 7 and 12 are not prime numbers, and there are no two prime numbers that add up to 19.
The only two prime numbers for which this can be the case are 2 and 5 - since one of the prime numbers has to be even.
Natural numbers that are greater than zero that have no other factors except one and themselves are called prime numbers. The first five prime numbers are 1, 3, 5, 7, and 11.
NUMBERS! no 3 is prime, 7 also prime and 8 is 4x2