n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
215: | \[215!!!!+1\] | 2 × 5689 × 267679 × 16922947 × 7614265937<10> × 57363843211136812214915640462140011586373544484650835436901680125007104253907<77> |