Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 179: | \[{4^{179}-1\over3}\] | 359 × 1433 × 58745093521<11> × 4347868190665879373495950562775707707143803<43> × 1489459109360039866456940197095433721664951999121<49> |