Learning about number theory makes me feel schizophrenic. Numbers have so many weird properties and patterns that seem like they should be messages from our Reptilian Humanoid Overlords or something
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I've actually been using http://Brilliant.org ! It's based around small quizzes that teach you the concepts and immediately have you apply them to practice problems. I try to do a quiz a day and it's been a nice, sustainable pace for learning something new
