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A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

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Here's a neat geometrical puzzle I was once shown Is it possible to divide a circle into a finite number of congruent parts some of which don't touch the center? Clarification: Find a shape for a t …
asked Nov 12 '14 by Michal
7
votes
The problem with this type of puzzle is that you can match any dataset using a polynomial of sufficiently high degree. For this one: $$f(x)=-0.225x^4+25.425x^3-300.7x^2+824.5x$$ giving $$f(75)=1977 …
answered Nov 15 '14 by Michal