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Q: What is the first number in the series 19 23 29 31?

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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.

Related questions

It is 23

27

27

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

15 is composite number 17, 19 and 23 are prime numbers.

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

Choose any prime number before 23 because the given numbers are all prime numbers

The next prime after 19 is 23

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