If you change the prime number 13 to base 7 you get 16. How can 16 be a prime number? Is it that 16 base 7 is a prime number in base 7 math? Can you give an example of how this could be true?
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Think of it in higher bases and it might make more sense.
Base 10: 11
Base 13: B
Now ask the question, how can B be prime?
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