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

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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 $1918$.


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