Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 73: | \[{18^{73}-1\over17}\] | 439 × 239879 × 846217 × 118874953 × 239560437299594270561494729006400795838750182585371182921815375952671<69> |