In all other numbers the sum of the digits is 17.
In all other, 2nd number = 1st number/3
In all others, 2nd number = 1st number + 6
In all others, 2nd number is 2 more than the first.
Except '64,73', all are having difference of 11.
All others first and last two digits are same.
All other pairs consists of prime number only.
In all other pairs, the difference between the two numbers is a multiple of 9.
5-2 = 3, 19-16 = 3, 27-23 = 4, 31-23 = 3
In all others, 2nd number = (2 x 1 st number) + 2
Second number is the next prime number to the first number.
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