53 59 61 67 71 73
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That's an infinite list.
53,59,61,67,69,71,73.
41, 43, 47
A single number cannot be relatively prime. Any pair of numbers between 50 and 100 of which one is a prime will be relatively prime. There are 728 pairs of numbers that are relatively prime and I have neither the time nor patience to list them all!
The prime numbers between 40 and 50 are 41 and 43.