Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 831: | \[2^{831}-1\] | 7 × 1663 × 1121297 × 3772542223 × 502746492223<12> × 660284006953<12> × 679758314119<12> × 31133636305610209482201109050392404721<38> × 6955979459776540052280934851589652278783<40> × 5950573776337857083075874442067543579480302367010830438026343467540674188668607309648191584891661956885759297060111559<118> |