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Math Help - A number divisible by 13,17 or 19

  1. #1
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    A number divisible by 13,17 or 19

    Hi,

    Is there any easy ways to identify whether a number is divisble by 13, 17 or 19?

    Thanks!
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  2. #2
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    Quote Originally Posted by ManuLi View Post
    Hi,

    Is there any easy ways to identify whether a number is divisble by 13, 17 or 19?

    Thanks!
    Have a look here: Divisibility rule - Wikipedia, the free encyclopedia
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  3. #3
    Super Member Bacterius's Avatar
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    Yes, this is quite interesting but I guess the rules for bigger prime numbers just get messy and heavy (for 17, subtract 5 times the last digit from the rest ...).

    Maybe you might like to consider working in particular bases and applying basewise division (that is, a division that is made trivial due to the base used). Although base conversion is not the easiest thing to do
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