It can be 1, 3, 7 or 9.
For example, 41, 53, 67 or 79
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Prime numbers greater than 10 will only end in 1, 3, 7 or 9.
How about: 11, 13, 17, 19 .... etc
The prime number between 20 and 30 whose ones digit is 7 greater than its tens digit is 23. The tens digit is 2, and the ones digit is 3, which is 7 greater than 2. Additionally, 23 is a prime number because it is only divisible by 1 and itself, with no other factors.
Any prime number greater than 10 is an odd number but cannot end in 5 as this makes it divisible by 5. Therefore the ones digit of any prime number greater than 10 must be 1, 3, 7 or 9.
There are 800 such numbers.