List of primes numbers from 3 to 21
Prime Numbers Between Calculator
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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