Base 16 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[{16^{81}-1\over15}\] | 34 × 7 × 13 × 19 × 37 × 73 × 109 × 163 × 2593 × 71119 × 87211 × 135433 × 246241 × 262657 × 279073 × 3618757 × 97685839 × 106979941 × 168410989 × 272010961 × 4977454861<10> |