# List of primes numbers from 3 to 21

## Prime Numbers Between Calculator

Enter an Interval:

Ex.: 1 to 100, etc.

There are 7 prime numbers between 3 and 21.

They are:

 3 5 7 11 13 17 19

There are 4 tween primes between 3 and 21.

The folowing are the sets of tween primes between 3 and 21:

(3,5); (5,7); (11,13); (17,19);

The sum of prime numbers between 3 and 21 is 75.

The average of prime numbers between 3 and 21 is 10.714.

The product of prime numbers between 3 and 21 is 4.8498 × 106.

Note: this calculator also includes the starting and the ending number, which form the interval, if they are primes.

You can use this calculator to get the list of prime numbers from 3 to 21 or between any two specified numbers, including them.

## What is a prime number?

A prime number is a number which is only divisible by and itself.

Among mathematicians, 1 is universally regarded as non-prime.

Zero has an infinite number of factors; thus not prime or composite.

## Definition of tween primes or what are tween primes?

For a pair of primes to be Twins, they must obey the following rule.

If i and j are twin primes, then both i and j must be individually primes and also should differ by 2, i.e. (i−j) = 2 or (j−i) = 2

Examples of tween primes sets (pairs):

(3,5); (5,7); (11,13); (17,19); (29,31); (41,43); (59,61); (71,73);

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