Number Theory

Prime Numbers

Identifying Primes


What is the next prime number in this sequence:

2,3,5,7,11,13,,?2, 3, 5, 7, 11, 13, \underline{\quad}, \ldots ?

True or false: the number 47 47 is prime.

Which of the following numbers is prime?

A,A+2,A+4A, \hspace{0.5cm} A+2, \hspace{0.5cm} A+4

If A>3,A>3, can all three numbers above be prime?

True or false: the number 21 21 is prime.


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