The first three prime numbers (2, 3, and 5) are unique in that all other primes, starting with 7, can be constructed from them using the formula x^n * y^n +or- z^n, where x=2; y=3; and z=5. This formula generates the set of all numbers not divisible by 2, 3 or 5, which, by definition, includes all primes >5 (For example, x^2 * y - z, or 2^2 * 3 - 5 = 7).
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squares of prime numbers
41,43, and 47 are all prime numbers. so there are three prime numbers between 40 and 50
The only two prime factors of 18 are: 2, 3
The number 2 is the only even prime number - all other even numbers are divisible by 2.
That's an infinite list.