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
Each set is made of the digits 2, 4, 6, 8
All the numbers are perfect cubes.
Let us see
As, 8 = 23
1331 = 113
4913 = 173
Similarly, 64 = 43
All are prime numbers.
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
Set of consecutive odd prime numbers.
In (12, 20, 28), every next number is obtained by adding 8 with the previous number and similarly, in (18, 30, 42).
every next number is obtained by adding 12 with the previous number.
In each set
2nd number = 1st number x 7
and 3rd number = 1st number x 8
Let us see
As, 14 = 2 x 7
and 16 = 2 x 8
Similarly, 21 = 3 x 7
and 24 = 3 x 8
As, 841= (29) 2
Similarly, 289 = (17)2
As for finishing the 'Leather', 'Tanning' method is used, in the same way for 'Fireworks' pyrotechnics is used
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