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How many integers less than 50 have exactly two distinct prime factors?
Wiki User
∙ 8y ago
Eight - all the prime numbers (the definition of which is a number with exactly two different factors) which are 2, 3, 5, 7, 11, 13, 17, 19.
It could be argued that any number with 3 or more different factors has 2 different factors (along with one or more other factors), which means all numbers less than 20 except 1 have two different factors, ie the 18 numbers 2-19; these numbers just don't all have exactly two different factors.
Wiki User
∙ 11y ago
Wiki User
∙ 8y ago6: 2, 3
10: 2, 5
12: 2, 3
14: 2, 7
15: 3, 5
18: 2, 3
20: 2, 5
21: 3, 7
22: 2, 11
24: 2, 3
26: 2, 13
28: 2, 7
33: 3, 11
34: 2, 17
35: 5, 7
36: 2, 3
38: 2, 19
39: 3, 13
40: 2, 5
44: 2, 11
45: 3, 5
46: 2, 23
48: 2, 3
23 of them.
Wiki User
∙ 10y ago23 of them.
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202
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What number has exactly 3 prime factors?
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What number less than 100 has exactly 4 prime factors?
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What number below 160 has exactly 3 prime factors?
30, 42, 66, 78, 102, 105, 114, 138 all have exactly three distinct prime factors.
How many distinct prime factors does 70 have?
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Does 20 have exactly 3 prime numbers?
The prime factorization of 20 is 2 x 2 x 5. That's three prime factors; two distinct prime factors.
What are distinct prime factors?
Distinct prime factors are the prime factors that are distinct (or different) from each other. A list of distinct prime factors is a list of one of each different prime number that is a factor. For example, the prime factors of 8 are 2, 2, and 2. The only distinct prime factor is 2, which occurs multiple times.
How many distinct prime factors does 168 have?
Three distinct prime factors.
How many distinct factors does 45 have?
Six distinct factors Two distinct prime factors
Is 3 a prime number because it doesn't have any factors?
3 is a prime number because it has exactly two distinct factors. The only factors of a prime number are 1 and itself. The only factors of 3 are 1 and 3, so it is a prime number.
What number has only 7 factors?
There are an infinite number of integers with "only 7 factors". Any number which is the product of exactly 7 prime numbers.
