n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
121: | \[121!!-1\] | 24 × 1230103432762338286744835791943713<34> × 4286896666604085103895606367460981994902249154228952577123210471553<67> |