Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 139: | \[{7^{139}-1\over6}\] | 19739 × 673039 × 36907186032510520494090542644478414425042667765511537140671634321685208913758955545681985719375774106220917<107> |