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

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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

Assuming that 001, 080, etc are not allowed (that is a leading zero or two is not permitted), the smallest number with exactly three digits is 100. The largest number with exactly three digits is 999. So there are 999 - 100 + 1 = 900 numbers with exactly three digits.

Related questions

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

Squares of prime numbers have exactly three factors.

4 and 9

Numbers with exactly three factors are squares of prime numbers.

The smallest number that has exactly three factors is 4.

Squares of primes.

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

8, 2*2*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.

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

There are no prime numbers with three factors. By definition, a prime number has exactly two factors - 1 and itself.

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