n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
159: | \[159!!+1\] | 2 × 132001 × 15531148537834287451848019<26> × 58919209978618300492361618198564012904883<41> × 22555951905073311526458823172360427372571266128179749797114819375752169<71> |