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Q: How many numbers between 1to 1000 have an odd numbers of factors?

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179 of them.

Eight - all the prime numbers (the definition of which is a number with exactly two different factors) which are 2, 3, 5, 7, 11, 13, 17, 19.It could be argued that any number with 3 or more different factors has 2 different factors (along with one or more other factors), which means all numbers less than 20 except 1 have two different factors, ie the 18 numbers 2-19; these numbers just don't all have exactly two different factors.

All numbers can be broken down into factor pairs. No matter how many pairs there are, it's an even number of factors. Squares have a factor pair that consists of the same number twice. When you list them, you list the number once.

There are 57 integers that are multiples of seven that fall between the numbers one and 400.

50

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There are three of them with exactly five factors.

The prime numbers (factors) of 1000 are: 2 and 5

There are 90 palindromic numbers between 100 and 1000

There are 168 prime numbers between 1 & 1000.

There are infinitely many numbers between them. Also there are infinitely many sequences that wil have two numbers between 1000 and 1.

111 numbers between 5 and 1000 are divisible by 9

Infinitely many.

3 integers: 1200,1500,1800

The easiest way to find out how many numbers are in between two points that form a range of numbers (i.e. How many numbers are in between 1 and 1000), is to subtract the first point from the second point and subtract one.Such as 1-1000 would be 1000 - 1 is 999, minus 1 is 998. Therefore there are 998 numbers between 1 & 1000.

There are eight such numbers.

There are 107 numerical palindromes between the numbers 1 and 1000, starting from 2 to 999.

There are 900 three-digit whole numbers between 1 and 1000

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