n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 243: | \[243!!!!!+1\] | 268819 × 417792580382054803<18> × 13586961980791816909241693319653521161320406478107211739265625896153740377<74> |