Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
81: | \[{17^{81}-1\over16}\] | 19 × 307 × 433 × 24733 × 1270657 × 6770748529<10> × 454194717025663<15> × 1313154695584063<16> × 904405077653173242898527606595551272070589<42> |