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Math Help - Sum of positive integer divisor

  1. #1
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    Sum of positive integer divisor

    Let *(x) be the function that calculates the sum of positive integer divisors of x.

    i.e *(6) = 1+2+3+6 = 12

    How do I go about finding all x such that *(x) = 12?

    Thanks
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  2. #2
    Senior Member roninpro's Avatar
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    Re: Sum of positive integer divisor

    You definitely know that x< 12, so how about using brute force?
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  3. #3
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    Re: Sum of positive integer divisor

    I need to find a pattern or formula of some sort. The next problem is to find x such that *(x) = 56. Brute force isn't exactly ideal here...
    Last edited by jzellt; October 22nd 2011 at 05:59 PM.
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