Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 721: | \[{4^{721}-1\over3}\] | 43 × 127 × 2550183799 × 8248287587<10> × 415141630193<12> × 10550281065119153<17> × 8142767081771726171<19> × 3976656429941438590393<22> × 76648826221799156068752387867047280732512230435080665839048571<62> × 40012856945802270595228036875681849172518880153534797152989581713852083249870047315824215054110251389708120091347<113> × 811838362875749000047045370307528756015249707861798385910598024828107320792728313897578386416339056669144506367786420486589665926009785110080921247744211385533548768303<168> |