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.
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.
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.
Each digit of second number is the square of the respective digit of the first number.
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