Two numbers: 5 and 7 :)
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4 of them.
Many prime numbers and many composite numbers.
8: 1,2,3,5,7,13,17,19
There are infinitely many of them.Some of them are given by:All numbers of the form 3n+1/n for n ∈ the prime numbers are rational numbers between 3 & 4, and as there are an infinite number of prime numbers, there are an infinite number of these.All numbers of the form 4n+1/n for n ∈ the prime numbers are rational numbers between 4 & 5, and as there are an infinite number of prime numbers, there are an infinite number of these.There are still more than the infinitely many given above.
There are 4 numbers that are prime between the number 10 and 20. They are 11, 13, 17, and 19.