Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 239: | \[{7^{239}-1\over6}\] | 479 × 871986721 × 643384173113837<15> × 4040609273925388685799856703093687<34> × 1460554269745214007935833120579032946601790902459669267662564771208500155479882660997623431371443792154252797189864883340577194711686770642917<142> |