2047/Historical Note

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