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: H.C. Williams and Harvey Dubner: The Primality of $R1031$ (Math. Comp. Vol. 47: pp. 703 – 711)  www.jstor.org/stable/2008184

• 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): $1111 \ldots 111111$