Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 350: | \[{21^{350}-1\over20}\] | 2 × 52 × 11 × 43 × 71 × 101 × 631 × 1471 × 3319 × 4201 × 24851 × 40841 × 81901 × 140351 × 185641 × 2031851 × 4149601 × 11093851 × 20028751 × 78555121 × 81867661 × 24602533201<11> × 315986798401<12> × 421503321597121<15> × 72413241922093801<17> × 248303068144516751<18> × 27385718497004633851<20> × 37686242599452410706868538086801<32> × 4853662284647061913896534715723251901<37> × 293125233886991211739535978630708361851<39> × 9881598936482470880598283508285190628200880454733829636202725501<64> × 6107498812503060189977652663684219147254525910663051537427182386752756045066004222730822829713729595685422017301<112> |