Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 188: | \[{18^{188}-1\over17}\] | 52 × 13 × 19 × 1129 × 4513 × 20681 × 49633 × 468121 × 168785273 × 220304417 × 1286609209 × 2156450281888888469625703321842052657<37> × 8694595042987947457948937711495049931245163<43> × 1502121672400075410467476353807805512381470434411741<52> × 283000552804612324998031105442040281801013193565594903<54> |