Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 144: | \[{18^{144}-1\over17}\] | 52 × 73 × 13 × 19 × 372 × 73 × 97 × 113 × 229 × 307 × 457 × 577 × 929 × 991 × 1153 × 25309 × 34327 × 465841 × 2474209 × 33388093 × 113607841 × 11019855601<11> × 42569092513<11> × 994416129981667873<18> × 1338258845052393545608356556801<31> × 3121305456784833993911822639198925029281<40> |