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

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Q: What are all the numbers less than 100 with exactly 3 factors that are prime?

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All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.

The squares of all prime numbers less than 10.The squares of all prime numbers less than 10.The squares of all prime numbers less than 10.The squares of all prime numbers less than 10.

4, 9, 25, 49 Squares of prime numbers.

4, 9, 25 and 49 They are squares of prime numbers.

Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.

4, 9, 25, and 49

prime squares 4, 9, 25, 49

Nothing special. They are squares of prime numbers.

Numbers can be checked to see if they are primes simply by factoring them. Every prime number has exactly two factors, 1 and the number itself. If there are more or less than 2 factors, the number is not a prime. 1 has only one factor so it is not a prime, and composite numbers have 3 or more factors.

Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.

Prime squares, like 4, 9, 25 and 49.

Prime numbers

Prime squares, like 4, 9, 25 and 49

Prime squares like 4, 9, 25, and 49.

The set of prime factors of the numbers from 1 to 15,000 would be the set of prime numbers between 1 and 15,000. The link below has a list of the first 10,000 prime numbers, so if you take the primes less than 15,000, you will have the set of prime factors of the first 15,000 numbers. For prime factors of individual numbers, check the related question, "What are the prime factors of the numbers from 1 to 200?" Also check for WikiAnswers questions in the form of "What are the prime factors of __?" and "What are the factors and prime factors of __?"

If the two numbers have no prime factors in common, their LCM will be their product. If there are prime factors in common, their LCM will be less than their product.

Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.

All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.

All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.

If there are no prime factors in common, the LCM will be the product. If there are prime factors in common, the LCM will be less than the product.

105

All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78. Need to know how to get the answer

2, 3, 5, 7, 11, 13 any number that is prime

32

The prime numbers less than 13 have the fewest factors. They are:235711