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?
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You definitely know that , so how about using brute force?
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; Oct 22nd 2011 at 04:59 PM.
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