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    #1
    Given a number that ends in 3, prove that it has a multiple that consists of only 1's.

    For instance 13 has the multiple 111111.

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    #2
    Quote Originally Posted by Klaas van Aarsen View Post
    Given a number that ends in 3, prove that it has a multiple that consists of only 1's.

    For instance 13 has the multiple 111111.

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    #3
    Quote Originally Posted by Klaas van Aarsen View Post
    Given a number that ends in 3, prove that it has a multiple that consists of only 1's.

    For instance 13 has the multiple 111111.

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    #4
    Quote Originally Posted by Klaas van Aarsen View Post
    Given a number that ends in 3, prove that it has a multiple that consists of only 1's.

    For instance 13 has the multiple 111111.

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    #5 Thread Author
    All correct.
    Thank you all, and nice to see different solutions to the same problem.
    They cover the solutions that I am aware of.

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