Only 729 is a perfect cube.
Except 44, all are prime numbers.
In all other numbers, the sum of the first two digits is equal to the third digit.
Except 28*, all others are multiples of 3.
Except 210, all other are square of some numbers.
The Except 64-73 all are having difference of 11.
Except 124, all other numbers are multiples of 3.
All except 18 are square of natural numbers.
(5)2 = 25, (3)3 = 9, (4)2 = 16.
Except 267 , all other numbers are one lass than the square of a certain number
9 - 2 = 7 . ? 72 = 49
13 - 2 = 11 ? 112 = 121
10 - 2 = 8 ? 82 = 64 ? 61
7 - 2 = 5 ? 52 = 25
? 272 = 2 + 7 + 2 = 11
210 = 2 + 1 + 0 = 3
240 = 2 + 4 + 0 = 6
304 = 3 + 0 + 4 = 7
The sum of digit of all number except 240 is a prime number where as sum of number 240 digit is a non-prime. Hence, it is different from all others.
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