Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 252: | \[{18^{252}-1\over17}\] | 52 × 74 × 13 × 19 × 29 × 372 × 43 × 73 × 127 × 229 × 307 × 337 × 449 × 457 × 631 × 991 × 1373 × 2143 × 17837 × 25309 × 26713 × 34327 × 46747 × 80207 × 153133 × 465841 × 1292257 × 1623833 × 2765953 × 31714369 × 32222107 × 33388093 × 337268233 × 607371619 × 939208692997<12> × 156107192084257<15> × 820207420126249<15> × 21899652142038022239553<23> × 6974796889885559915764172408527<31> × 4591020241431358911787281317666857153<37> × 1577079548322860035705724045583180415367043349<46> |