Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 549: | \[{21^{549}-1\over20}\] | 463 × 1831 × 15373 × 12519763 × 85775383 × 57733681069<11> × 1128331159687<13> × 649654074718993<15> × 1814065850324073713<19> × 8367949010264709226934528299<28> × 57398774322642953389748085156004642469<38> × 4178836442844651515511329527862686487954990612118576877028484300815594328136337574487489188497255773480504997158374044802523431896824973648289859<145> × [18348392203770427214754362332009749912097960526593466062559089540108877972957165455815108431093588153025947554678744538509894748516723893979125370625021622343753060597130102857042685634863140009425764029763752842037515122433231855502483252140616440140197478709122111765752722842904528787089830955261405971261242605545584367545005992941178104036462944957764705910083136311590966184986463342676173480840265057732579493908747748215303843<434>] |