# What are all the prime number for 16 to 32?

##### 1 Answer

Nov 5, 2016

#### Explanation:

The prime numbers between

#17, 19, 23, 29, 31#

The odd composite numbers in that range are:

#21 = 3xx7#

#25 = 5xx5#

#27 = 3xx3xx3#

**Bonus**

Of the prime numbers we list, two are special:

#17 = 2^(2^2)+1#

which is one of the few known Fermat primes.

Pierre de Fermat conjectured that any number of the form

#31 = 2^5-1#

which is a Mersenne prime, being of the form