Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 351: | \[2^{351}-1\] | 7 × 73 × 79 × 937 × 6553 × 8191 × 86113 × 121369 × 262657 × 446473 × 29121769 × 7830118297<10> × 571890896913727<15> × 93715008807883087<17> × 150832426800173710177<21> |