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Math Suggestions

@mathsuggestions

Curated by Epsilon. Stuck on a proof? These posts might help you come up with the rest. Submissions welcome!
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Trick or Treat!

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You get: OEIS sequence A004169: "Values of m for which a regular polygon with m sides cannot be constructed with ruler and compass".

7, 9, 11, 13, 14, 18, 19, 21, 22, 23, ...

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