Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 298: | \[{4^{298}-1\over3}\] | 5 × 1193 × 1789 × 650833 × 38369587 × 12961064789<11> × 14641916303149<14> × 86656268566282183151<20> × 8235109336690846723986161<25> × 7984559573504259856359124657<28> × 27243386602395588437243602121<29> × 11011808951971745915313242336927641<35> |