Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 246: | \[2^{246}-1\] | 32 × 7 × 83 × 739 × 13367 × 165313 × 3887047 × 164511353 × 8831418697<10> × 13194317913029593<17> × 177722253954175633<18> |