317/Historical Note
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Historical Note on $317$
The prime nature of the repunit $R_{317}$ was discovered by Hugh Cowie Williams in $1978$.
John David Brillhart had previously mistakenly identified it as composite.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1,111,111,111,111,111,111$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1,111,111,111,111,111,111$