n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
181: | \[181!!+1\] | 24 × 331 × 977 × 3517957 × 579645089 × 103138099503110418829<21> × 19023739082367239359365583943<29> × 5045219270737007945317478005534083582695943223<46> × 189288539813458888110290261068863197964489347586281<51> |