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Q: What numbers less than 1000 has 3 as prime factors?

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210 has 4, which is the maximum possible. There are other numbers with 4 different prime factors.

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 __?"

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

Prime numbers

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.

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.

One of them.

google / 1000 primes

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.

There are 168 prime numbers less than 1,000.

Prime squares have three factors. There are 11 of them in that range.

31

They all are prime numbers except 1

2

3,9,27,81,243,729

168 are.

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.

There are 31 numbers less than 1,000 which have an odd number of factors. They are: 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,841,900,961.

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.

They are: 41, 43 and 47 that have only 2 factors because they are all prime numbers

A number is prime if its only two factors are one and itself.

210

solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.

Perfect squares have an odd number of factors. There are 31 perfect squares less than 1000.

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