Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
211: | \[{5^{211}-1\over4}\] | 5594292675731<13> × 37973612258438259769<20> × 2047676978710884689089<22> × 144115393066310961947385445876092809<36> × 12117471589560986330527567615247238634978313717528365907029<59> |