n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 293: | \[293!!!!+1\] | 2 × 11410787 × 8102362246635474654311735017564451<34> × 356170377305987990645389852711501293366229<42> × 19566767598770927104758703920650476444059607211292365379232215982631<68> |