Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 238: | \[{18^{238}-1\over17}\] | 17 × 19 × 137 × 239 × 443 × 449 × 953 × 1667 × 20707 × 80207 × 304879 × 32222107 × 5616807617<10> × 6407827084457<13> × 54458809889863<14> × 1895634885375961<16> × 7563707819165039903<19> × 9553228880989692242072057106316140044705248099<46> × 1602240978857329459560765288397838845641998491314519553<55> × 142613585494032388107039215098460999999404970478166538519375298212120378883753934210817<87> |