I love teaching elementary number theory. But we should call it what it is, "black magic." Quick, without even reaching for a pencil (nevermind a calculator): What's the remainder when 5^7812 is divided by 11? If you've seen 3 weeks of number theory, you can answer immediately
Replying to @AlexKontorovich
"Any sufficiently advanced technology is indistinguishable from magic." ~ Arthur C Clarke
8:15 PM - 14 Feb 2020
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