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|Posté le: Jeu 1 Fév - 08:41 (2018) Sujet du message: Was 1 Ever Considered to Be a Prime Number?
I learned that a prime number was one divisible by only itself and 1, but my 4th grader says that per her book a prime requires 2 different factors. I note your Greek reference for 1 not being prime, which
would indicate that I'm wrong and there was no change in definition.
However, Ray's New Higher Arithmetic (1880) states, "A prime number is one that can be exactly divided by no other whole number but itself and 1, as 1, 2, 3, 5, 7, 11, etc." Can you tell me when this change
happened and why?
I didn't find the right solution from the Internet.
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