In base ten, ten is not a Prime number. It is divisible by both 2 and 5. In base 2, however, 10 is equal to two in base ten and two is a prime number.
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The number 10 is not prime. A prime number is divisble by itself and one, only. 10 is divisible by 1, by 2, and by 5. Thus, 10 is not a prime number.
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The prime number less than 10 that, when added to either 10 or 20, results in a prime number is 3. When you add 10 to 3, you get 13, which is a prime number. Similarly, when you add 20 to 3, you get 23, which is also a prime number.
3 is a prime number, and 4 and 10 are composite.
3 is a prime number.