Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{17^{91}-1\over16}\] | 212057 × 513059 × 25646167 × 2919196853 × 986802324691<12> × 1128882253376333<16> × 633917591815554047<18> × 101604859007816647702158801323372000819<39> |