Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 128: | \[{15^{128}-1\over14}\] | 210 × 17 × 113 × 257 × 1489 × 2689 × 7121 × 151553 × 179953 × 70237697 × 1391359510721<13> × 12779004583099009<17> × 5765807395792521302977<22> × 17347644250739140028840698753<29> × 5040054997946379205834956885834881<34> |