I need help with an algotrithm
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Thread: I need help with an algotrithm

  1. #1
    Member
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    Dec 2003
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    48

    I need help with an algotrithm

    Trying to figure out the algotrithm that will find all perfect numbers between 1 and any given int.
    A perfect number is defined as: A perfect number is an integer that is equal to the sum of it's divisors as an example 6 is divisible by 1,2 and 3 and 6=1+2+3.

    Any help or ideas would be great, thanks.

  2. #2
    Senior Member
    Join Date
    Jul 2002
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    339
    Why don't you tell us what you've got so far (a skeleton is fine), and let us help you by filling up the missing parts?

    Peace always,
    <jdenny>
    Always listen to experts. They\'ll tell you what can\'t be done and why. Then go and do it. -- Robert Heinlein
    I\'m basically a very lazy person who likes to get credit for things other people actually do. -- Linus Torvalds


  3. #3
    Member
    Join Date
    Dec 2003
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    48
    Here is what i know:
    Find how many factors of n - this is where i am confused, i am not exactly sure how to find all the factors, if it matters i am using java to do it....the main reason is i dont know how big to make the array for the factors...


    Check to see if the f1 + f2 ... = n

  4. #4
    Senior Member
    Join Date
    Jul 2002
    Posts
    339
    That's a good start!

    For a recent discussion of how to find all the factors of a given integer, follow this thread:
    http://www.antionline.com/showthread...hreadid=253049

    Then instead of displaying the factors, store them in an array, and check to see if the sum is equal to the integer.

    Peace always,
    <jdenny>
    Always listen to experts. They\'ll tell you what can\'t be done and why. Then go and do it. -- Robert Heinlein
    I\'m basically a very lazy person who likes to get credit for things other people actually do. -- Linus Torvalds


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