17 is a Prime number because it has only two factors which are itself and one
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One mathematical fact about number 23 is that number 23 is an odd number. Another mathematical fact about number 23 is that number 23 is prime number.
it's prime
That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.That's not a "mathematical principle", it is an approximation of the number pi.
Just writing "81" is mathematical enough for my taste. After all, that's a number, and numbers are mathematical.
23 is a prime number.