n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 254: | \[254!!!!!+1\] | 5 × 241 × 733 × 6907 × 11847584381<11> × 31727396807059576277287092476491<32> × 117337795165687202007831469496876953353628434918061<51> |