Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 444: | \[{21^{444}-1\over20}\] | 22 × 11 × 13 × 17 × 61 × 149 × 223 × 421 × 463 × 593 × 3181 × 3331 × 4663 × 31081 × 4922629 × 21475393 × 1681762703 × 1872452679217<13> × 30983921565277<14> × 30308467970641907119<20> × 105199608637709036593<21> × 1589679976083984537481<22> × 1207649413444041466160839<25> × 7995105693353508392600118377453099<34> × 379919184478057330357419845346252603881265273961<48> × 1506746820371368761835938047460405587619684925236106295173833131814373634461587418519<85> × 1788811503934407101186498308824780458046366903126234228620483937887212343860808538302796253<91> × [3214069820085792356638133204568735155835958813899772169608518491406334799753928227021276300640053550412816136311248957747019648078845598488452215298897244519394309<163>] |