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Intressanta problem

Här finns några problem som jag stött på och som verkar/verkade intressanta.

Kromatiskt tal på sfären
Polynom som antar kvadrattal
Kung och kryss
Vända brickor
Gissa oändligt många hattar
Änglar och demon
Kvadrat på fyra linjer
Självrättande koder
Peka ut mynt
Bilkent januari 2020, "derivata sekvens"
Bilkent februari 2021, ''oändlig många dåliga primtal''

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