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We are announcing a week of intensive courses to prepare for the list of Olympiads: we start on May 4th and will be working until the 10th! Subscribe to get into the intensive course: https://vk.com/app5898182_-118664176#... The mathematical part (what you need to know and the theory of quadratic residues) starts at 10:50 Intensive course schedule: Number theory block Wednesday-Thursday Introductory video 01.05. Friday, 10:00 Quadratic residues 02.05. Saturday, 10:00 Primitive roots 03.05. Sunday, 10:00 Lemma on clarifying the indicator Fly in, it will be powerful! To pay for the intensive course, go to the mailing list: https://vk.com/app5898182_-118664176#...