Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 193: | \[{7^{193}-1\over6}\] | 14669 × 85728285355409267895679<23> × 756937155910390044916932629<27> × 5994946327304712468705571873826831<34> × 4539546970485536436424707475812653713<37> × 81731259002098132847866542087337412273<38> |