Second number is the next prime number to the first number.
In all others, 2nd number = (2 x 1 st number) + 2
5-2 = 3, 19-16 = 3, 27-23 = 4, 31-23 = 3
In all other pairs, the difference between the two numbers is a multiple of 9.
All other pairs consists of prime number only.
In all other numbers the sum of the digits is 17.
Second number is the reverse of the first number.
Each digit of second number is the square of the respective digit of the first number.
Second number is the difference of the square of the digits of the first number.
Except '9, 64', all number are consecutive squares.
In all the given numbers, the middle digit is twice in second group.
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