n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 268: | \[268!!!!-1\] | 58648270978183436959413257592284037878698427<44> × 13542947599154449162799956057922693697584793321076176908532328949325038051010160144930026637<92> |