53 59.
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There are 3 prime numbers from 40 to 50:41, 43 and 47
All the prime numbers between 50 and 75 are 53, 59, 61, 67, 71 and 73.
Fifty of them
There are 15 prime numbers up to 50.
An infinity. There is an infinity of numbers between any two numbers. I you want whole numbers, there are 31.