There are 5 prime numbers between 8 and 28: 11 13 17 19 23
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There are 8 prime numbers between 10 and 40: 11 13 17 19 23 29 31 37.
There are 4 prime numbers between 20 and 40.
NUMBERS! no 3 is prime, 7 also prime and 8 is 4x2
Numbers that have 2 factors are prime numbers; Numbers that have 4 factors are either: * the cube of a prime; or * the product of two different primes; Numbers that have 8 factors are either: * a prime to the power 7; * the product of a prime cubed and different prime; * the product of three different primes.
It can be 1, 2, 4, 6 or 8.