Except 56 all can be expressed as power of 2.
Only 119 has different factors, 7 and 17 and no factors are repeated.
Except 22 all are in the from 112 x 1, 112 x 2, 112 x 3 etc.
Each of the numbers except 380, is either one less or one more than the square of a certain number.
? 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.
9 - 2 = 7 . ? 72 = 49
13 - 2 = 11 ? 112 = 121
10 - 2 = 8 ? 82 = 64 ? 61
7 - 2 = 5 ? 52 = 25
In all the numbers except 383, the middle digit is the product of the other two digits.
28 is the only number with all even digits.
566 is the odd one out as the rest of the numbers are perfect squares.
761 is the only prime in the group.
All are multiple of 3 except 83.
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