Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 591: | \[2^{591}-1\] | 7 × 7487 × 407791 × 50070703 × 304292056417<12> × 26828803997912886929710867041891989490486893845712448833<56> × 927701611035392243771813127127397103891685719848882103485113848962936182860818392833900833911<93> |