Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
218: | \[{7^{218}-1\over6}\] | 23 × 5233 × 14551288401737861<17> × 10059414761347582747<20> × 63505707690048880101785428103<29> × 23540782932240399632107200158745339309941271547<47> × 309936643044108190233102627233785196588910840411364776136097975124151<69> |