Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 344: | \[{4^{344}-1\over3}\] | 5 × 17 × 173 × 257 × 431 × 4129 × 9719 × 101653 × 500177 × 2099863 × 3855260977 × 1759217765581<13> × 2932031007403<13> × 64082150767423457<17> × 1425343275103126327372769<25> × 33770734168253651800370989375796994825389296318018601048482005531172856260013942500368975908606689<98> |