Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 327: | \[2^{327}-1\] | 7 × 745988807 × 20597276734348736647<20> × 33157029794959983067039<23> × 88116165754061081804047<23> × 870035986098720987332873<24> |