Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 105: | \[{15^{105}-1\over14}\] | 7 × 11 × 43 × 61 × 71 × 241 × 4931 × 1743463 × 4167731 × 39225301 × 2817034275427<13> × 53096945644422356461<20> × 24596480723711374110433501<26> × 12340745958492257916284855626741<32> |