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Q: What number is greater than 12 and less than 40 that only has 3 factors?

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There is no number that is greater than 50 AND less than 10 as 10 is less than 50! However, a number greater than 10 and less than 50 which fits the bill is 11 - it only has 2 factors 1 & 11 (it is prime) and has multiples 6x11 (=66) and 55x11 (=605). If the question was greater than 50 and less than 100 then the number could only be 66 as 66 is the only number greater than 50 which has 66 as a multiple, but 66 has 8 factors (1, 2, 3, 6, 11, 22, 33, 66), meaning there is no number in that range.

There is no such number. All multiples of 6 must have 1, 2, 3, and 6 as factors. And each one must have the number itself as a factor. That makes 5 factors. But if these are the only factors, then the number cannot be greater than 40.

The only number less than 100 with exactly nine factors is 36. 19 is not one of the factors.

A number that has only one and itself as factors is a prime number and so therefore it can't have four other identical factors.

prime number if it only has less than 2 factors

Yes.

A prime number.

A prime number.

That's a prime number.

It is 97 which has only two factors because it is a prime number

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