Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 295: | \[2^{295}-1\] | 31 × 4721 × 132751 × 179951 × 5794391 × 128818831 × 3812358161 × 3203431780337<13> × 452824604065751<15> × 4410975230650827973711<22> |