The numbers are perfect square,
Let us see
As, 144 = 122, 256 = 162, 324 = 182
Similarly, 625 = 252
The difference between the 1st and 2nd digit of the numbers is 5
As, 5 + 2 + 5 = 12
8 + 1 + 3 = 12
7 + 1 + 4 = 12
Similarly, 6 + 0 + 6 = 12
First number is multiplied by 5 to got second number.
As, 14 x 5 = 70
Similarly, 75 x 5 = 375
Second number is the digit sum of the 1 st number.
As, 5 + 5 = 10
Similarly, 8 + 8 = 16
Second is the square of the first number.
As, 112 = 121
Similarly, 252 = 625
All are prime numbers.
All the numbers are perfect cubes.
Let us see
As, 8 = 23
1331 = 113
4913 = 173
Similarly, 64 = 43
Each set is made of the digits 2, 4, 6, 8
In each set
2nd number = 1st number + 10-1
3rd number = 2nd number + 101
Let use see
As, 223 + 101 = 324
and 324 + 101 = 425
Similarly, 554 + 101 = 655
and 655 + 101 = 756
Set of consecutive odd prime numbers.
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