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Unique Properties of 10
- 10 is the base of our number system
- In base n, n is always written "10"
- 10 is the only semi-prime number with the property that the sum as well as the difference of its prime divisors are primes (2 + 5 = 7 and 5 - 2 = 3)
- 10 is the smallest noncototient, a number that can not be expressed as the difference between any integer and the total of coprimes below it