Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
499: | 20959 × 1998447222711143545931606352264121<34> × 39075504626391841678304934944805852280404731716385642050296152320994438836806257083337312828162589099799400566633<113> |