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Q: Which numbers under 1000 have 2 as their only prime factor?

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168 prime numbers under 1000.

3,9,27,81,243,729

Since all numbers have one as a factor, there is no number with three as its only factor.

There are 168 prime numbers under 1,000 . There are also 25 primes under 100, 62 primes under 300, and 95 primes under 500

The prime numbers (factors) of 1000 are: 2 and 5

100

There are 168 prime numbers between 1 & 1000.

13 prime numbers

The prime factors of 1000 are: 2, 5

That's an infinite list, started by 1024

3, 9, 27, 81, 243, 729

Prime No: between 1000 to 9999= 54_( 42x3)

1. As long as there are two prime numbers in a set, the only common factor for the set will be 1.

They are in exponents: 23*53 = 1000

3, 9, 27, 81, 243, 729

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

3, 9, 27, 81, 243, 729

3, 9, 27, 81, 243, 729

2357111317192329313741434753596167717379838997101103107109113127131137139149151157163167173179181191193197199211223227229233239241251257263269271277281283293307311313317331337347349353359367373379383389397401409419421431433439443449457461463467479487491499503509521523541547557563569571577587593599601607613617619631641643647653659661673677683691701709719727733739743751757761769773787797809811821823827829839853857859863877881883887907911919929937941947953967971977983991997

23 x 53 = 1000

Negative numbers don't have prime factorizations.

If you're asking about prime factorizations, the process is the same, no matter the size of the number. Use a factor tree. Larger numbers are likely to have more branches.

3, 9, 27, 81, 243, 729

Any number from 1 to 1000 can be a factor. If you are asking us to factor all the numbers between 1 and 1000, the answer is no.

49/1000 can not be reduced because 7, the only prime factor of 49, is not a factor of 1000.