Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 389: | \[2^{389}-1\] | 56478911 × 4765678679<10> × 4684435266636161232578932847604331726884269415306219621279642876954933236537677535849040755779223719<100> |