n!!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
268: | \[268!!!!!-1\] | 512984518251575149398125017244185592923967441171<48> × 3394073449688062515854415418985824448650698288301212415071973<61> |