n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 163: | \[163!!-1\] | 2 × 9187 × 146560016564897167320423252079740883222950099794554935698686867<63> × 53103497811288938022279550885004561661507002224670457829602029735006427466268953<80> |