Today, I will invent something (ridiculous).
I will invent the prime root (unofficially).
You have to take a number's prime factors and add them.
And Then take that number's prime factors and add them.
Continue doing that until you get a prime number. That is (unofficially) the prime root.
Say for example we have 15. The prime factors are 3 and 5. Add them and we get 8. The prime factors are 2 but there are 3 of them, So 2+2+2=6. The prime factors of it is 2 and 3. Add them and we get 5. STOP! We got a prime number. So the prime root of 15 is 5 (unofficially).
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How you got this step :
The prime factors are 2 but there are 3 of them, So 2+2+2=6.
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Because 2^3 =8 and we can just multiply 2 by 3 to get the sum of the factors (unofficially).
Remember! This is just nonsense