Base 9 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 91: | \[{9^{91}-1\over8}\] | 547 × 1093 × 8737 × 398581 × 595141 × 797161 × 4011586307 × 2354116499281<13> × 2452788561133<13> × 3745603812007166116831643<25> |