Q: List the smallest four numbers that have exactly three factors?

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4, 9 and 25.

Numbers with exactly three factors are squares of prime numbers.

4? the factors of 4 are 1,4 and 2

Numbers with three factors are squares of primes. So: 4, 9, 25

The LCM of the given three numbers is 24

Related questions

4, 9 and 25.

the four smallest numbers are 4, 9, 25 and 49.

4 and 9

Squares of prime numbers have exactly three factors.

Numbers with exactly three factors are squares of prime numbers.

The smallest number that has exactly three factors is 4.

4? the factors of 4 are 1,4 and 2

Squares of primes.

8, 2*2*2

I belive it is 4. The factors of 4 are 1,4, and 2.

A number has exactly three factors if and only if it is the square of a prime number.

By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.