Prime numbers have only two factors, one and themselves. The number 5 is prime.
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if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23
Do you mean prime factors? If yes, then 143.
The only prime number that's even is 2 the rest are odd but that doesn't mean ALL odd numbers are prime. Many are but not most.
The mean is when you calculate the sum of a list of numbers and then you didvide by the number of numbers in the list.
If you mean consecutive numbers that are prime? than the answer is 2,3 are consecutive numbers which are prime. except for this pair it is impossible for consecutive numbers to be prime because every second number is multiple of 2