n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 205: | \[205!!!!+1\] | 2 × 1756966950491181678274347111877016786168013290867<49> × 6619215828363001117591446013259618814970913542039<49> |