137,438,953,471/Historical Note
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Historical Note on $137 \, 438 \, 953 \, 471$
$137 \, 438 \, 953 \, 471$ was the $3$rd Mersenne number to be demonstrated composite.
This was done in $1640$ by Pierre de Fermat, who demonstrated it had $223$ as a divisor.
It is in fact the $4$th Mersenne number in sequence to be composite.
However, the status of the $3$rd such composite Mersenne number, $536 \, 870 \, 911$, was not established until Leonhard Paul Euler's work in $1732$.
Sources
- 1919: Leonard Eugene Dickson: History of the Theory of Numbers: Volume $\text { I }$ ... (previous) ... (next): Preface