Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 361: | \[2^{361}-1\] | 524287 × 9522401530937<13> × 36450568206770608791178096385783<32> × 25811221179243952186920238827413131290368483933428434308863<59> |