Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 445: | 31 × 2671 × 618970019642690137449562111<27> × 1460384540571001412284141831845453026637206635511<49> × 1213879697009617667840625625239307278583085260903037111<55> |