Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 222: | \[{21^{222}-1\over20}\] | 2 × 11 × 223 × 421 × 463 × 3331 × 4663 × 31081 × 21475393 × 1681762703 × 1872452679217<13> × 30983921565277<14> × 30308467970641907119<20> × 105199608637709036593<21> × 1207649413444041466160839<25> × 7995105693353508392600118377453099<34> × 379919184478057330357419845346252603881265273961<48> × 1506746820371368761835938047460405587619684925236106295173833131814373634461587418519<85> |