Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 297: | \[2^{297}-1\] | 7 × 23 × 73 × 89 × 199 × 153649 × 262657 × 599479 × 8950393 × 33057806959<11> × 170886618823141738081830950807292771648313599433<48> |