An IMO Number Theory Problem about Periodic Sequences | IMO 2017 P1 Solution

In today's video I go over a number theory problem that showed up in the 2017 International Mathematical Olympiad. The IMO is considered one of the hardest math competitions and often, the solutions require quite elegant tricks. This solution required making sense of observations, which is quite an underrated skill. If you wanna see me solve some problem, let me know in the comments.
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