Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
51: | \[{17^{51}-1\over16}\] | 103 × 307 × 409 × 10949 × 1749233 × 2699538733 × 162260934541944127<18> × 326099734864828369<18> |