Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 499: | \[{4^{499}-1\over3}\] | 20959 × 163673 × 825347 × 61176403 × 1192425792950157874662150001<28> × 1998447222711143545931606352264121<34> × 1575585587524885013687391114684244158499565933913187<52> × 35137888682991172687207804802805853896809097192922393<53> × 39075504626391841678304934944805852280404731716385642050296152320994438836806257083337312828162589099799400566633<113> |