I'm not understanding what this symbol is meaning. 
I'm also struggling to understand what is and what isn't a primitive root. The examples it gave in the book for three squared makde sense, but I don't see why three cubed isn't a primitive root as well.
I think it's so neat how we can use mods to figures out of a number is prime! Who knew this little quirky beatbox looking at groups of numbers could rub so useful!
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