Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 395: | \[2^{395}-1\] | 31 × 2687 × 12641 × 202029703 × 5435488351<10> × 16203007441<11> × 1113491139767<13> × 3868132159624916546905272573063237265865977199403213448652782202624081<70> |