SOLUTION: How many two-digit primes are there whose units digit is more than its tens digit?

Here are all the two-digit prime numbers.  Now you are to pick out the
ones whose units digit is more than its tens digit, and count them.

11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 
47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

Edwin