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Assuming you mean positive whole numbers, then all numbers greater than 1 can be factorised using prime numbers only.

Some of the numbers are prime themselves, eg 2, 3, 5, 7 and so factorise into themselves; others are composite and so factorise into the product of 2 primes, eg 8 = 2 x 2 x 2, 12 = 2 x 2 x 3

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Q: What numbers less than 20 can be factorised with prime numbers only?
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Related questions

What Three prime numbers which multiply to make 225?

225 cannot be factorised into the product of only 3 prime numbers.


Why 2 is prime number?

two is a prime number because you can't put anything into two. think about it. Because the prime numbers can be divided only by 1 or the number itself. They cannot be factorised.


A set of prime numbers less than 18?

Prime numbers are such number which are only divisible by 1 and by itself only..{1,2,3,5,7,11,13,17}


What are the six prime numbers less than 10?

There are only four prime numbers less than 10. They are 2, 3, 5 and 7.


Are they only 6 prime numbers less than 10?

No. There are only 4.


What prime numbers are less than 100 but even?

The only even prime number is 2.


What prime numbers are even and less than 100?

There is only one prime number which is even - that is 2 - and it also happens to be less than 100. All other prime numbers are odd.


How to factorise a2 plus b2?

a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.a2 + b2 cannot be factorised in real numbers, only in complex numbers. The fact that you ask this question indicates that you are nowhere near old enough to be studying complex numbers.


How many prime numbers less than 50 that are even numbers?

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Is there 26 prime numbers up to a one hundred?

No, there are not 26 prime numbers up to 100. There are actually 25 prime numbers up to 100.


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Are there only two prime numbers less than ten?

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