Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 339: | \[2^{339}-1\] | 7 × 3391 × 23279 × 65993 × 1868569 × 10113049 × 1066818132868207<16> × 320021624768405574452943847<27> × 4760137992283599860814226997712217<34> |