n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 263: | \[263!!!!-1\] | 22 × 2685646484227699567501454032259364341<37> × 78874912226416473512506890737106966838041788013768616771242156194618639973063675334646698665841<95> |