11,111,111,111,111,111,111,111

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Number

$11 \, 111 \, 111 \, 111 \, 111 \, 111 \, 111 \, 111$ is:

A prime number


The $3$rd repunit prime


The $23$rd repunit


The $24$th permutable prime after $2$, $3$, $5$, $7$, $11$, $13$, $17$, $31$, $37$, $71$, $73$, $79$, $97$, $113$, $131$, $199$, $311$, $337$, $373$, $733$, $919$, $991$, $1 \, 111 \, 111 \, 111 \, 111 \, 111 \, 111$


Also see

No further terms of this sequence are documented on $\mathsf{Pr} \infty \mathsf{fWiki}$.
No further terms of this sequence are documented on $\mathsf{Pr} \infty \mathsf{fWiki}$.


Sources

  • 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $11,111,111,111,111,111,111,111$
  • 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $11,111,111,111,111,111,111,111$
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