n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 212: | \[212!!-1\] | 281 × 311 × 11236568527738231<17> × 49218301391467499248611493667<29> × 192416997659587268652461260831687531672763518488002246830562483007626846624575987337343908037266538577742387755395311694867388939791150158478688363035757<153> |