Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 286: | \[2^{286}-1\] | 3 × 23 × 89 × 683 × 2003 × 2731 × 8191 × 724153 × 6156182033<10> × 10425285443<11> × 158822951431<12> × 15500487753323<14> × 5782172113400990737<19> |