There are 4 prime numbers under ten.
They are: 3+5+11 = 19
There are 15 prime numbers less than 50.
Such a number would either have to be a perfect cube of a prime number, such as 33 = 27 (the only one in the specified range), or the product of exactly two different prime factors, such as 2 x 3, 2 x 5, 3 x 31, etc.
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.
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
There are 34 prime numbers under 140.
Here is how you can calculate that: Multiply different prime numbers together, until your product exceeds the number 300. Then, you go back one step.
The prime numbers under 16 are 2,3,5,7,11 & 13.
They are: 3+5+11 = 19
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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.