This is the only prime number in the group.
This is the only prime number in the group.
Except '97', all are divisible by 11.
Only '729' is a perfect cube.
All others are prime numbers.
All others have only 2 factors with prime number.
26 = 2 x 13, 34 = 2 x 17, 72 = 2 x 2 x 2 x 3 x 3,
46 = 2 x 23, 38 = 2 x 19
All others are divisible by 17.
All others are divisible by 6.
All others are prime numbers.
All others numbers are one less then the cube of natural numbers.
This is the only square in the group.
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