n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 245: | \[245!!!!+1\] | 2 × 3151043682629498419<19> × 3337396319078879646545987<25> × 396635168686262593814932654407970631094735966843041128467878662626300999623671<78> |