Wieferich's Criterion/Historical Note
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Historical Note on Wieferich's Criterion
Arthur Wieferich discovered what is now known as Wieferich's Criterion in $1909$.
It had profound implications for Fermat's Last Theorem, in that it demonstrated that the only cases that needed to be considered were those for the Wieferich primes, of which only $2$ are known less than $10^{17}$.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1093$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1093$