n!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 281: | \[281!!!+1\] | 64197767 × 47249745689<11> × 5390186937901568891832650065032948449<37> × 713786654364128149841586482094524202549587277861613<51> × 1068570759189130084949930256962836602362416343648955854339735763180660430193765260171<85> |