n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 217: | \[217!!+1\] | 2 × 857 × 3863 × 5869 × 571279 × 227855945011547634780130146755785418368091178331786064999353465625472167714951549485328056392333051147940193756052592315614826429390138814586498990709499628258474413039299132624314940418924093<192> |