Теория чисел на олимпиадах： от Физтеха до Межнара
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![Старейшая нерешённая задача [Veritasium]](https://sun9-27.userapi.com/HwNc9xdS0TRu8_hZ-mrB_7LUwdOGk1J_iW9s9w/8JdH34aHEDU.jpg)
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