Definition:Poulet Number/Historical Note

Historical Note on Poulet Number
The first person to point this out was, in whose honour these numbers are sometimes called Sarrus numbers.

set about calculating these Fermat pseudoprimes to base $2$, first up to $50$ million in $1926$, then up to $100$ million in $1938$.

They have since been named Poulet numbers in honour of that feat of calculation.