n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
191: | \[191!!!!+1\] | 2 × 531205721 × 709634751623136817<18> × 4820445441295454237852633513<28> × 83739956946675024254759705256716993<35> |