Are All Perfect Numbers Even?/Progress/Form/Historical Note
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Historical Note on Form of Odd Perfect Number
The form that an odd perfect number would need to take was proved by Leonhard Paul Euler.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $28$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $28$