Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
557: | \[2^{557}-1\] | 3343 × 21993703 × 4565508951414453792719<22> × 22053236096920219270632521586535711<35> × 63725217520100446091019213316114800470054259870518161822841838235099774015887061706672583915057828311<101> |