317/Historical Note

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): $1,111,111,111,111,111,111$
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