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## Prime Numbers

2, 3, 5, 7, ... The set of prime numbers is the alphabet of mathematics that allows us to communicate across the universe.

# Identifying Primes

What is the next prime number in this sequence:

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

True or false: the number $$47$$ is prime.

Which of the following numbers is prime?

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

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

True or false: the number $$21$$ is prime.

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