элементарная математика фрерарда
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![Самая простая нерешённая задача — гипотеза Коллатца [Veritasium]](https://sun9-58.userapi.com/AooFjOGl1-XEHhwZNu0iF17j1HTqNDOZpymaHw/C4Oh2uPjzAg.jpg)