If I understand the question correctly,
the digits 1, 2, 3, 4 and 5 appear the same number of times.
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33 (3x11) 39 (3x13) 51 (3x17)
The prime numbers between 50-60 are 53 and 59.
There are 60 such numbers.
The prime numbers between 50 and 60 are 53 and 59.
Two prime numbers, 61 and 67, are the only prime numbers between 60 and 70.