Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 73: | \[{17^{73}-1\over16}\] | 293 × 1621745371 × 3038535503 × 319344640907<12> × 596137412912777<15> × 151192644932534555018760925054337887684171<42> |