Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
101: | \[{7^{101}-1\over6}\] | 607 × 809 × 6263 × 1226962153072980952980067096888460031879516017670288348423584305043494594529<76> |