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/