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Q: What is smallest number whose prime factors are 3?

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1155

number 1155

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It is 11 which is a prime number whose factors are itself and one

2 and 3 are the smallest prime numbers. So answer is 2^3 * 3^3 = 216

That number is 724.

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72

It is a Prime Number.

There are infinitely many prime numbers, and also infinitely many twin primes so there is no answer to the question.

The smallest prime number, of course, is 2. The smallest prime number whose digits add up to 2 is, of course, 2. The next-smallest is 11. It is left as an exercise for the reader to determine whether the other numbers whose digits add up to 2 (e.g. 101, 1001, 10001) are prime.

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