Every whole number between 1 and 50 is a factor of one or more whole numbers
between 1 and 100.
' 1 ' is a factor of every whole number.
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4, 9, 25, and 49 are all of the numbers between 1 and 100 having 3 factors.
The sum of all the odd numbers from 1 through 100 is 10,000
90. all the numbers from 10 through 99
1 is a common factor of all numbers.
All numbers that are the square of primes have exactly 3 factors.