<page_title> Repunit </page_title> <section_title> List of repunit primes base b {\displaystyle b} </section_title> <table> <cell> 2, 19, 23, 317, 1031, 49081, 86453, 109297, 270343, ... </cell> <cell> A004023 </cell> </table>
The repunit is prime for n = 2, 19, 23, 317, 1031, ... is sequence of A004023 in OEIS.