Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 685: | \[{4^{685}-1\over3}\] | 11 × 31 × 1097 × 15619 × 119191 × 920641 × 7084271 × 472748641 × 226338814638851<15> × 32127963626435681<17> × 105498212027592977<18> × 32032215596496435569<20> × 5439042183600204290159<22> × 236564778812552300459414801<27> × 83648644144524510111773141111<29> × 13166248872913462314441528794261286918041120435881<50> × 272994033845190769952516834173641131460537974593214267709001<60> × 420802580523767875237950310262820019135749166881960341067173726664556394738285561675988953259150250436976162677581144923361<123> |