n!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
* 251: | \[251!!!-1\] | 34 × 3557 × 19744713696340556359<20> × [1174607157301248593534418549984311956119167727542992363969804685737995508948255609290365103705046912926055019119657811262254535818048149387333<142>] |