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Questions
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157
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Prime numbers characterization

jan 29 at 14:51 Antisha 17●4

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145
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Mersenne primes problem

jan 29 at 14:09 GH 15.1k●1●31●53

 
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Numbers of a certain form not expressible as squares

jan 28 at 20:19 Antisha 17●4

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Does this system of equations admits a solution?

jan 22 at 11:21 quid 13k●31●51