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Questions
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Enlarging a tetrahedron with integer edge lengths

oct 20 at 18:51 Vita Kala 159●1●6

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4
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Does the set of happy numbers have a limiting density?

nov 11 11 at 2:58 David Moews 170●4

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Guessing a subset of {1,…,N}

mar 16 11 at 3:27 Ravi Boppana 585●2●6●10

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Round-Robin Tournaments and Forests

aug 24 10 at 0:04 Gjergji Zaimi 37.5k●2●72●149

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Does 2^m = 3^n + r have finitely many solutions for every r?

mar 20 10 at 12:21 Felipe Voloch 16.6k●2●36●61