Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 183: | \[{21^{183}-1\over20}\] | 463 × 1831 × 15373 × 12519763 × 57733681069<11> × 1128331159687<13> × 1814065850324073713<19> × 57398774322642953389748085156004642469<38> × 4178836442844651515511329527862686487954990612118576877028484300815594328136337574487489188497255773480504997158374044802523431896824973648289859<145> |