One is not Prime/Proof 2/Historical Note
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Historical Note on Proof 2 of One is not Prime
The reasoning that $1$ should be excluded from the set of prime numbers based on its divisor sum was by Leonhard Paul Euler.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1$