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Can anyone explain the smiley-face diagram which, according to the text, can be used to implement a primality test?

• abhi9u 3y ago
  It is supposedly an inside joke and not an actual test. Source: https://twitter.com/michael_nielsen/status/1724989620029620524 https://twitter.com/michael_nielsen/status/17249896200296205...
  • jjgreen 3y ago
    I've seen jokes get past academic reviewers, but an inside joke?