19 and 23 are prime.
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
19+17+23+17=76 76/4 (the number of numbers) = 19
20 is the next number greater than 19. The next prime number greater than 19 is 23.
If you're working with (23 + 5), then you'll work long and hard and still never find a way to get 19. There are none. The sum of 23 and 5 is 28, and if you get any other number, then you've added 23 to 5 incorrectly.
It is 23
The first number in that series is 19. That series is part of a larger series that starts with 2.
15 is composite number 17, 19 and 23 are prime numbers.
19 and 23 are prime.
It is 23 followed by 29
19 + (44 + 23) = (19 + 44) + 23
Since the two number are coprime, the answer is 23*19 = 437
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
23
19+17+23+17=76 76/4 (the number of numbers) = 19
19, 20, 21, 22, 23
The next prime after 19 is 23