Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 361: | \[{4^{361}-1\over3}\] | 174763 × 524287 × 9522401530937<13> × 36450568206770608791178096385783<32> × 6874301617534827509350575768454356245025403<43> × 25811221179243952186920238827413131290368483933428434308863<59> × 1303254116461108697268759335821585860897008415946720083246259<61> |