Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{19^{155}-1\over18}\] | 151 × 911 × 28337411 × 5243095143668244620331859090402894321<37> × 243270318891483838103593381595151809701<39> × 17988845261756800228935900058061046787757681060904886470833890491191188753758749007020727017622448935626969771<110> |