Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 441: | \[2^{441}-1\] | 73 × 73 × 127 × 337 × 92737 × 126127 × 309583 × 649657 × 5828257 × 4432676798593<13> × 2741672362528725535068727<25> × 4487533753346305838985313<25> × 7086423574853972147970086088434689<34> |