Base 2 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
527: | \[2^{527}-1\] | 131071 × 2147483647 × 13306086595097866632236752730067629415649399<44> × 50061214622509969230528187280149191683596667776057<50> × 2343254763791128850444156587107279568075476376903297<52> |