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en.wikipedia.org/wiki/Prime_factor

For a positive integer n, the number of prime factors of n and the sum of the prime factors of n (not counting multiplicity) are examples of arithmetic functions of n ...

And just as a refresher, a prime number is a number that's only divisible by itself and one, so examples of prime numbers-- let me write some numbers down.

www.mathsisfun.com/prime-factorization.html

Example 1: What are the prime factors of 12 ? It is best to start working from the smallest prime number, which is 2, so let's check: 12 ÷ 2 = 6. Yes, it divided ...

www.mathsisfun.com/definitions/prime-factor.html

A factor that is a prime number. In other words: any of the prime numbers that can be multiplied to give the original number. Example: The prime factors of 15 are ...

www.shmoop.com/basic-operations/prime-factorization-examples.html

Pre-Algebra giving you a hard time? Shmoopâ€™s free Basic Operations Guide has all the explanations, examples, and exercises youâ€™ve been craving.

Here are some examples of how to find the Prime Factorization of a number: Example 1 - Find the Prime Factorization of 228.