n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 218: | \[218!!!!+1\] | 331 × 90012610901<11> × 3768323707063<13> × 1399164813836982423798720666590783796481<40> × 7963216136318555787760652616140567781857<40> |