n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 206: | \[206!!!!-1\] | 293 × 26927 × 1841704753052422652308971705347900305589<40> × 8787630194600255430701317831002640858212771923342281<52> |