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Q: What numbers less than 1000 have 3 as their only prime factor?

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3, 9, 27, 81, 243, 729

3, 9, 27, 81, 243, and 729.

3, 9, 27, 81, 243, 729

168 are.

3, 9, 27, 81, 243, 729

3, 9, 27, 81, 243, 729

One of them.

google / 1000 primes

There are 168 prime numbers less than 1,000.

2

31

2, 4, 8, 16, 32, 64, 128, 256, 512

2 and 7 are prime numbers less than 10 that are factors of 42 and 70.

210

1

For this kind of question, I would suggest looking up a table of prime numbers. As an alternative, you can try to find factors for each of the numbers - if it has a factor, it is NOT a prime. For this range of numbers, testing for prime numbers up to 13 is appropriate. (If 17 is a factor of one of these numbers, the other factor is less than 17, so you would already have found it before you reach 17.)

When they have a common prime factor. When their GCF is greater than 1.

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.

There are 46 prime numbers less than 200.

The prime numbers less then 86 are; 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79 and 83.

The prime numbers that are less than 14 are: 2,3,5,7,11,13.

There are 25 prime numbers less than 100

There are 35 prime numbers less than 150.

There are no negative prime numbers.

3, 9, 27, 81, 243, 729