1031/Historical Note

Historical Note on $1031$

The prime nature of the repunit $R_{1031}$ was proved by Hugh Cowie Williams and Harvey Alan Dubner in $1986$.


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): $1,111,111,111,111,111,111$
  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1111 \ldots 111111$
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