Source: wikibot/list-of-repunit-primes
= List of repunit primes
{wiki=List_of_repunit_primes}
A **repunit** is a number consisting entirely of the digit 1. For example, the numbers 1, 11, 111, 1111, and so forth are repunits. The mathematical representation of a repunit \\( R_n \\) is given by: \\\[ R_n = \\frac\{10^n - 1\}\{9\} \\\] where \\( n \\) is the number of digits (or "ones") in the repunit.