Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 378: | \[2^{378}-1\] | 34 × 72 × 19 × 43 × 73 × 127 × 337 × 379 × 5419 × 87211 × 92737 × 119827 × 262657 × 649657 × 1560007 × 77158673929<11> × 127391413339<12> × 56202143607667<14> × 207617485544258392970753527<27> |