Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 84: | \[{18^{84}-1\over17}\] | 52 × 74 × 13 × 19 × 29 × 43 × 229 × 307 × 337 × 449 × 457 × 1373 × 17837 × 46747 × 80207 × 153133 × 1623833 × 31714369 × 32222107 × 607371619 × 156107192084257<15> × 820207420126249<15> |