Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 274: | \[2^{274}-1\] | 3 × 1097 × 15619 × 32127963626435681<17> × 105498212027592977<18> × 32032215596496435569<20> × 5439042183600204290159<22> |