Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
409: | \[2^{409}-1\] | 4480666067023<13> × 76025626689833<14> × 3881196575913244673719425770871246487895686937951690944453838586764072695131586617955811936945129<97> |