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Q: Does 20 have exactly 3 prime numbers?

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No.

Squares of prime numbers have exactly three factors.

It is 30 because 2*3*5 = 30

Numbers with exactly three factors are squares of prime numbers.

There are actually 8 prime numbers less than 20: 2, 3, 5, 7, 11, 13, 17, and 19

Prime squares

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

The prime numbers required are 2, 3, 5 and 7

That's an infinite list.

Prime squares

Squares of prime numbers.

No, they are not a set of prime numbers.

The squares of all prime numbers above 2 have exactly 3 factors.

How about: 2*3*5 = 30 which is the product of the 1st three prime numbers

That's an infinite list.

3, 5, 11

Yes.

prime squares

No. 15 is the product of two prime numbers: 3 and 5

3 is a prime number because it has exactly two factors which are whole numbers: itself and one. This is the definition of a prime.

The prime numbers 0-20 are 2, 3, 5, 7, 11, 13, 17, and 19.

3 + 17 = 20

They are 3+17 = 20

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

Squares of prime numbers, like 4, 9 and 25.