Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 251: | \[{8^{251}-1\over7}\] | 503 × 4519 × 12049 × 54217 × 220116640729<12> × 180797717027593<15> × 178230287214063289511<21> × 61676882198695257501367<23> × 12070396178249893039969681<26> × 863218260980519005763915824855147314295765517543826889081011766885471679775766425863907913320356346097265183520060097<117> |