n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 251: | \[251!!!!!+1\] | 124245221 × 136441309 × 9749842511978260433645599354400239<34> × 39017628992957372417006117630987890334462921316287<50> |