Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 856: | \[2^{856}-1\] | 3 × 5 × 17 × 643 × 857 × 843589 × 4209809 × 13012913 × 8174912477117<13> × 23528569104401<14> × 37866809061660057264219253397<29> × 84115747449047881488635567801<29> × 162259276829213363391578010288127<33> × 992005069953996722026755979686303668059315249<45> × 750305988172977439124935900508680523429897046359842693070433217278337<69> |