Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
85: | \[{13^{85}-1\over12}\] | 103 × 443 × 30941 × 28152511 × 15798461357509<14> × 11435433293542010176161611<26> × 562139171639747303605338416886252422621<39> |