Last updated: 15 May 2023

Repunit (probable) Primes
Term: Rn = (10n - 1) / 9
Reference: PrimePages
Number Digits When PRP found by ... Status
R8177207 8177207 May 2021 Ryan Propper, Serge Batalov PRP
R5794777 5794777 May 2021 Ryan Propper, Serge Batalov PRP
R270343 270343 Jul 2007 Voznyy and Budnyy PRP
R109297 109297 Apr 2007 Bourdelais and Harvey Dubner PRP
R86453 86453 Oct 2000
15 May 2023
Lew Baxter
Andreas Enge (proven prime via CM)
Prime
R49081 49081 Sep 1999
Mar 2022
Harvey Dubner (PRP)
Paul Underwood (proven prime via Primo)
Prime
R1031 1031 Dec 1985 Harvey Dubner & Hugh C. Williams Prime
R317 317 - - Prime
R23 23 - - Prime
R19 19 - - Prime
R2 2 - - Prime