Q: What are all the numbers less than 100 that have odd proper factors?

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All even numbers greater than 2 have even proper factors, since they all have 2 as a proper factor.

The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.

Square numbers, like 36 and 64.

The composite odd numbers from 9 to 99.

No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. Composite numbers are numbers with more than 2 factors and more than 1 proper factor. Prime is the opposite of composite.

No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. Composite numbers are numbers with more than 2 factors and more than 1 proper factor. Prime is the opposite of composite.

There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.

No.

Prime numbers

They all are prime numbers except 1

There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.

If the two numbers have no prime factors in common, their LCM will be their product. If there are prime factors in common, their LCM will be less than their product.

Nine numbers.

If the two numbers have no common factors other than 1, the LCM will be their product. If there are other common factors, the LCM will be less.

Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.

The ones with less than three factors.

12 and 18

All of the numbers less than six can be factors, and all integers have a least one factor that is less than six. Here's a set of factors less than 6: (1, 2, 3, 4, 5)

The factors that are composite numbers, those that have more than two factors.

All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.

There are 31 numbers less than 1,000 which have an odd number of factors. They are: 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400,441,484,529,576,625,676,729,784,841,900,961.

11,22,33,44,55,66,77,88,99

48

10,20,30,40,50,60,70,80,90

By some definitions prime numbers don't have proper factors. In other definitions, their only proper factor is 1. Either way, your answer is the next prime number after 50, which would be 53.

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