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alpha0  ·  4680 days ago  ·  link  ·    ·  parent  ·  post: 1 is not a prime
http://mathworld.wolfram.com/PrimeNumber.html

"It is a question of definition". Tomorrow's deeper understanding may (re)define 1 to be a prime number again. Let's just put it this way: Gauss considered 1 a prime number ...