1,111,111,111,111,111,111/Historical Note

Historical Note on $1 \, 111 \, 111 \, 111 \, 111 \, 111 \, 111$

The prime nature of $1 \, 111 \, 111 \, 111 \, 111 \, 111 \, 111$ was discovered by a reader of one of Henry Ernest Dudeney's newspaper puzzle columns in $1918$.

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