Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 404: | \[{4^{404}-1\over3}\] | 5 × 17 × 809 × 9491060093<10> × 5218735279937<13> × 7432339208719<13> × 600503817460697<15> × 341117531003194129<18> × 53425037363873248657<20> × 4126631533969610752526181761<28> × 845100400152152934331135470251<30> × 588943501843708599443948572545716455743917429442946085514657968934735722314417529833656361841<93> |