Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 377: | \[2^{377}-1\] | 233 × 1103 × 2089 × 5279 × 8191 × 148055441 × 359661017 × 249018815918315199700031851161772880156221637084521986234342836024160025575777017<81> |