I found 105,63 and 27
The square of any prime number has exactly three factors: 22, 32, 52, etc.
How about 30 or 105
Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.
Numbers can be checked to see if they are primes simply by factoring them. Every prime number has exactly two factors, 1 and the number itself. If there are more or less than 2 factors, the number is not a prime. 1 has only one factor so it is not a prime, and composite numbers have 3 or more factors.
Nothing special. They are squares of prime numbers.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
How about 105 whose prime factors are 3, 5 and 7
105
27
The square of any prime number has exactly three factors: 22, 32, 52, etc.
How about 30 or 105
105 is one such number.
Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.
Numbers can be checked to see if they are primes simply by factoring them. Every prime number has exactly two factors, 1 and the number itself. If there are more or less than 2 factors, the number is not a prime. 1 has only one factor so it is not a prime, and composite numbers have 3 or more factors.
Nothing special. They are squares of prime numbers.
105 and the primes are 3, 5, and 7
105=3*5*7it has to be only three factors and they are all prime105