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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How we “spell” the numbers has nothing to do with properties like primality – it’s still the exact same number. The number seven is prime whether you’re French and call it “sept”, or German and call it “sieben”. Similarly, primality doesn’t change because you write a number in a different base.
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