n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[260!!!!!+1\] | 53 × 176329 × 67891771 × 153854258441202503<18> × 1834688524353742266884845033829447437138848028069906154261695174997112121<73> |