Is it true that every integer you can think of has a multiple written out only with \(0\)s and \(1\)s?

I am excited to tell you that I just released the alpha version of my “Pydont's” book, a book that compiles all my “Pydon't” articles. You can get the book at leanpub:

A screenshot of a black screen with some white 0s and 1s

Problem statement

Let \(k \in \mathbb{Z}\) be an integer. Is there an integer \(n\) such that \(n\) is a multiple of \(k\) and \(n\) only has \(0\)s and \(1\)s in its decimal expansion?

As an example, if \(k = 2\) we could have \(n = 10\).

Give it some thought...

If you need any clarification whatsoever, feel free to ask in the comment section below.


You can read the solution here to compare with your own solution.

If you liked this article and would like to support the mathspp project, then you may want to buy me a slice of pizza 🍕.

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