Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 559: | \[2^{559}-1\] | 431 × 8191 × 9719 × 2099863 × 3180000071 × 9215285895065526291256518741915902569<37> × 893727031418219528215703263500245746111426327976710088873802347504988954469046303695621351442273545673249<105> |