Nothing special.
They are squares of prime numbers.
24
The square of any prime number has exactly three factors: 22, 32, 52, etc.
The answer is 25 because it has the factors 1,5,25! :)
I found 105,63 and 27
25
The smallest number that has exactly three factors is 4.
24
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
The square of any prime number has exactly three factors: 22, 32, 52, etc.
4, 9, 25
105
27
49 has exactly 3 factors (1, 7, and 49) and is greater than 40 and less than 60.
3*5*7*9 = 945 ...check if any number less than that has exactly four distinct factors.
The answer is 25 because it has the factors 1,5,25! :)
It is 30.
How about 105 whose prime factors are 3, 5 and 7