Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 493: | \[{4^{493}-1\over3}\] | 59 × 233 × 1103 × 2089 × 4931 × 43691 × 131071 × 244529 × 3033169 × 3616649 × 10353001 × 408071156372794293927147176542113833<36> × 2215770261497265379833107511085365192789406654906026048465503447237245674887475208872166313<91> × 9705965830054591736524329221017810064201521004178349356202268282852670198911141357299732185324536769414538999508070197039<121> |