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Numbers under 100 with three different prime factors are 30, 42, 66, 70 and 78.

Numbers under 100 with three different prime factors, at least one of which has multiplicity > 1 are 8, 12, 18, 20, 27, 28, 44, 45, 50, 52, 63, 68, 75, 76, 92, 98 and 99.

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They are:

8, 12, 18, 20, 27,

28, 30, 42, 44, 45,

50, 52, 63, 66, 68,

70, 75, 76, 78, 92,

98, 99.

There are some that have more than 3 - which means that they do have 3.

[That last part is like the old riddle: how many months have 28 days - and the answer is all of them. Eleven have more than 28, but they do have 28.]

Q: What numbers under 100.prime have 3 prime factors?

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There are 4 prime numbers under ten.

30, 42, 66, 70 and 78.

There are 15 prime numbers less than 50.

By definition, a product of two primes has atwo factors (other than 1 and itself) and so it cannot be prime. So the set is not closed.

There are 168 prime numbers under 1,000 . There are also 25 primes under 100, 62 primes under 300, and 95 primes under 500

Related questions

There are no prime numbers anywhere that are divisible by 2 and 7.

There are 4 prime numbers under ten.

Prime Numbers under 6 are 2,3,5

30, 42, 66, 70 and 78.

There are 34 prime numbers under 140.

The prime numbers under 16 are 2,3,5,7,11 & 13.

If you look at the related question, "What are the prime factors of the numbers from 1 to 200?" (provided in the link below), take the prime numbers, and show them with multiplication signs between them, then you will have the prime factorization. Examples: The prime factors of 15 are 3 and 5. Therefore, the prime factorization is 3 x 5. The prime factors of 42 are 2, 3, and 7. Therefore, the prime factorization is 2 x 3 x 7. The prime factors of 64 are 2, 2, 2, 2, 2, and 2. Therefore, the prime factorization is 2 x 2 x 2 x 2 x 2 x 2. If you want the prime factorization of a specific number, it is sometimes listed under questions of the form, "What are the prime factors of __?" or "What are the factors of __?" or "What are the factors and prime factors of __?"

The prime squares, like 4, 9, 25 and 49

All the numbers from 2 to 19 are multiples of prime numbers.

168 prime numbers under 1000.

no, not all prime numbers are closed under addition. why? because, when you add 2 prime numbers you will not always get a prime number. example: 5+3= 8 5 and 3 are prime numbers but their sum is 8 which is a composite number..

There are 15 prime numbers less than 50.