In the United States, today is abbreviated 10/31. Define the th repunit number as

,

a base-10 number consisting of consecutive 1s. For example,

,

and so on.

It turns out that is the largest known prime repunit number.

In the United States, today is abbreviated 10/31. Define the th repunit number as

,

a base-10 number consisting of consecutive 1s. For example,

,

and so on.

It turns out that is the largest known prime repunit number.

*Posted by John Quintanilla on October 31, 2017*

https://meangreenmath.com/2017/10/31/repunit-prime/

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