1, 3, 5, 7, 9, 11 and just keep adding 2 until you get to 99.
50 of them.
All of the odd numbers in that range can be factors.
99
99 is an odd number. Even numbers are evenly divisible by two, while odd numbers are not.
45 percent are both even and odd digits
The sum of all odd numbers 1 through 99 is 9,801.
There are 50 odd numbers between 0 and 100.Five of them (1, 3, 5, 7, and 9) are outside the range you're considering.That leaves 45 of them, including 11 and 99.
100
99^2 == 9,801
Infinity
2500
The numbers are 31, 33 and 35.