Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 133: | \[{7^{133}-1\over6}\] | 29 × 419 × 4733 × 401563177 × 2662276961 × 4534166740403<13> × 373740808373213<15> × 897558513407803666357<21> × 44565794432124976145013684073215440137<38> |