n!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 251: | \[251!!!+1\] | 2243 × 19178899 × 28098971 × 9189818801<10> × 915423125503045056727589<24> × 657113180030478954121164075908252626015531680187081827772077253914732574149878626928733527726437565748630272754047<114> |