Two, Three, but not SixPro Problems > Math > Number and Quantity > Number Theory > Divisors
Two, Three, but not Six
How many integers between 1 and 100 inclusive are multiples of either 2 or 3, but not of 6?
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What number is missing from the following list?
1, 2, 3, 4, 6, 8, 9, 18, 24, 36, 72
An obelisk has no more than 100 stairs. If I go up the stairs two at a time, there will be one step left over at the top. If I go up the stairs three at a time, there will be two left at the top. If I go up the stairs seven at a time, there will be six stairs left over at the top. What is the maximum number of stairs the obelisk could have?
Reduce the following number to its prime factorization, without use of a calculator: 1006005. Explain the steps in your process.
The greatest common factor of two positive integers is 12, and their least common multiple is 72. If the sum of the numbers is less than 72, what are the numbers?
How many integers between 1 and 1000 inclusive are multiples of either 2 or 3?
x has 2n - 9 more divisors than x - 4, and it has 2n - 7 divisors more than x + 5.
What are the possible values of n, if x is a positive integer less than 50?
The least common multiple of x and 36 is 180. The greatest common factor of x and 36 is 4. What is the value of x?