Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 109: | \[{7^{109}-1\over6}\] | 14551288401737861<17> × 63505707690048880101785428103<29> × 23540782932240399632107200158745339309941271547<47> |