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.
23
It is 23
It is not a prime number. 19 x 23= 437.
21 is composite.
It is 23
To find the next number in the series 16, 23, 19, 19, 22, 15, 25, we can look for a pattern among the numbers. The differences between consecutive numbers are +7, -4, 0, +3, -7, +10. The next difference appears to be -6, which would lead to the next number being 25 - 6 = 19. Therefore, the next number in the series is 19.
27
27
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.
Choose any prime number before 23 because the given numbers are all prime numbers
23