Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 44: | \[{18^{44}-1\over17}\] | 52 × 13 × 19 × 23 × 89 × 199 × 16127 × 51217 × 536801 × 6301307 × 55547468813<11> × 2570735949673<13> |