Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 527: | \[{4^{527}-1\over3}\] | 3163 × 4217 × 43691 × 131071 × 715827883 × 2147483647 × 578189648968825099<18> × 13306086595097866632236752730067629415649399<44> × 50061214622509969230528187280149191683596667776057<50> × 2343254763791128850444156587107279568075476376903297<52> × 607173430386779873493260015812289162550729990656369609567935988690218091433498759721726806311209529659896188187130667939<120> |