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Q: Which number between 30 and 40 has an odd number of factors?

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No.

A number that has exactly an odd number of factors is a power of another number. A number between 10 and 30 that is a power is 16. It is 24 (as well as 42) and its factors are 1, 2, 4, 8, and 16.

23 is an odd number between 10 and 30 that gives a remainder of 2 when divided by 7.

The factors of a number cannot be greater than the number itself. So there are no factors of 4 between 30 and 50.

Even number.

15

The positive integer factors of 30 are: 1 2 3 5 6 10 15 30 The odd factors are therefore 1, 3, 5, 15

31 and 37 each have two factors.

30 is an even number.

No. For example, 30 is an even number but two of its factors are odd; 5 and 15.

22

Yes.

21 23 25 27 29

21, 23, 25, 27, 29

48 has 10 factors.

Any number between 30 and 40 can be a factor. The common factors of 30 and 40 are 1, 2, 5 and 10.

If you include 30, both 24 and and 30 have 8 factors, the most in that range.

If you are adding, it's impossible. An odd number of odd numbers must total an odd number!

30: 1, 2, 3, 5, 6, 10, 15, 30

36 does.

It is: 36

36 has 9 factors.

30 is the even number.

The sum of an odd number of odd numbers can't be an even number.

20 and 28 both have six factors.

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