6, 9, 15, 21, 24, 28, 30

In each number except 427, the middle digit is the sum of other two.

Each of the numbers except 54 is multiple of 5.

The pattern is 2 ³, 3 ³, 4 ³, 5 ³, 6 ³, 7 ³. But, 100 is not a perfect cube.

Each of the numbers except 14 is an odd number.

The number '14' is the only EVEN number.

P.W. of Rs. 12,880 due 8 months hence	= Rs. [ 12880 x 100 ] 100 + ❨ 18 x 8 ❩ 12
	= Rs. ❨ 12880 x 100 ❩ 112
	= Rs. 11500.

Each of the numbers except 23, is perfect square.

The pattern is 1 ², 2 ², 3 ², 4 ², 5 ², 6 ², 7 ². But, instead of 5 ², it is 20 which to be turned out.

(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1

But, 64 is out of pattern.

Each of the numbers except 21 is an even number.

Each of the numbers except 72 is a perfect square.