n!!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 281: | \[281!!!!!-1\] | 5 × 379 × 8641 × 8041480304607073<16> × 9599844167135311<16> × 1905712762966707280794951283180506856460090330566348681616330982188816861863<76> |