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Triangulating a donut

What is the best way to cut a donut up into tetrahedra?

Twin primes

Are there are infinitely many primes p such that p + 2 is also prime?

Can you cut a rectangle into 3 congruent non-rectangular pieces?

n/2 and 3n+1

Pick a positive whole number n; if odd, replace with 3n+1, if even divide by 2, repeat ...

Is there an amphichiral 2-component link with linking number 8?

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