Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 51: | \[{21^{51}-1\over20}\] | 463 × 38047 × 1502097124754084594737<22> × 51233569124705721849500009982296618143<38> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 51: | \[{21^{51}-1\over20}\] | 463 × 38047 × 1502097124754084594737<22> × 51233569124705721849500009982296618143<38> |