Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
48: | \[{15^{48}-1\over14}\] | 27 × 13 × 17 × 113 × 211 × 241 × 1489 × 3169 × 3877 × 7121 × 179953 × 1659649 × 1248882721 × 2562840001 |