All other pairs consists of prime number only.
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.
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.
Second number is the reverse of the first number.
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