Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 376: | \[2^{376}-1\] | 3 × 5 × 17 × 283 × 2351 × 3761 × 4513 × 13264529 × 1198107457 × 7484047069<10> × 23592342593<11> × 165768537521<12> × 140737471578113<15> × 4501946625921233<16> × 181352306852476069537<21> |