n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 252: | \[252!!!!+1\] | 127 × 1447 × 14487450103428437330618624436121<32> × 1662540941617225343826014625104058217981<40> × 38104811952052877067560146036608842998329892301029<50> |