2047/Historical Note
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Historical Note on $2047$
$2047$ was the $1$st Mersenne number that was demonstrated to be composite.
This was done in $1636$ by Hudalrichus Regius, who demonstrated it to be $23 \times 89$.
Sources
- 1919: Leonard Eugene Dickson: History of the Theory of Numbers: Volume $\text { I }$ ... (previous) ... (next): Preface