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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?

Goldbach conjecture

Every even number greater than 2 is the sum of 2 primes. True or false?

Does every triangle have a periodic orbit?

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